296 results about "Staged combustion" patented technology

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 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 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 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 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.

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.

The invention relates to the technical field of boiler combustion control, in particular to a through-flow boiler ultra-low nitrogen combustion control system based on multistage flue gas recirculation. Comprising a flue gas grading circulation unit; the low-nitrogen combustion regulation and control unit is used for realizing staged mixed combustion of fuel and circulating flue gas, and a staged combustion structure is matched with an air-fuel ratio dynamic regulation technology; the working condition parameter sensing unit is used for acquiring boiler combustion and flue gas state parameters in real time, integrating a multi-source sensor module and constructing a multi-dimensional operation parameter set; and the intelligent cooperative control unit is used for coordinating dynamic control of the ultra-low nitrogen combustion process. High-temperature and low-temperature independent flue gas circulation branches are arranged through the flue gas staged circulation unit, and a staged combustion structure of a main combustion section and a re-combustion section of the low-nitrogen combustion regulation and control unit is combined, so that the problem of non-uniform distribution of a hearth temperature field caused by compact combustion space and dramatic change of a flow field of the through-flow boiler can be solved; therefore, the generation of thermal nitrogen oxides is inhibited.

The invention discloses flue gas recirculation and oxygen-enriched combustion collaborative denitration equipment for a pulverized coal fired boiler, and belongs to the technical field of collaborative denitration. The pulverized coal boiler comprises a heat exchange tank, and a combustion tank and a smoke return pipe are arranged in the heat exchange tank. One side of the smoke return machine shell communicates with a combustor shell, and the combustor shell communicates with the combustion tank. An igniter and a graded oxygen-enriched combustor are arranged in the combustor shell, and the graded oxygen-enriched combustor comprises a central oxygen channel structure, a pulverized coal air channel structure and a compensation oxygen channel structure; core flames of pulverized coal air are ignited through the central oxygen channel structure, then the pulverized coal air with low oxygen content sprayed out of the pulverized coal air channel structure is ignited through the core flames, and a low-oxygen combustion section close to the root of the fire tongue is formed. Oxygen is sprayed out through the compensation oxygen channel structure, so that pulverized coal air is subjected to oxidation reaction and is fully combusted; according to the invention, a staged combustion effect can be formed, nitrate substances generated by a pulverized coal oxidation reaction are greatly reduced, and the capability of denitration of combustion flue gas is improved.

The application discloses a low-NOx ammonia fuel combustion system based on plasma combustion support X The generated staged ammonia gas combustion system comprises a high-frequency high-voltage power supply, a dielectric barrier plasma generator, a gas distribution system (a blower and an ammonia storage tank), a combustion chamber and a swirler; the dielectric barrier plasma generator comprises a high-voltage electrode, an insulating medium, a swirler and a ground electrode; and the gas distribution system comprises a blower and an ammonia storage tank. The application utilizes dielectric barrier to generate ammonia gas plasma discharge, reduces the difficulty of ammonia gas combustion and improves the stability of ammonia gas combustion; utilizes the swirler to generate rotating airflow and improves the combustion efficiency; utilizes ammonia gas staged combustion to further reduce NOx emission; and the ideal staged ratio is that the volume ratio of ammonia gas plasma to side wall ammonia gas is 20% (10%-30%), so that the ammonia gas plasma can be fully discharged, and the ammonia sprayed from the side wall can also be fully combusted.

A gas turbine unit includes a compressor (2), a turbine (5), a combustor assembly (3), and a fuel supply assembly (4); the combustor assembly (3) includes at least one combustor unit (7); the combustor unit (7) includes a first-stage combustor (8) and a second-stage combustor (9); the first-stage combustor (8) includes a first-stage incinerator (11) and a first-stage combustion chamber (12); the first-stage fuel is an amino fuel; wherein the second-stage combustor (9) includes a second-stage incinerator (13) and a second-stage combustion chamber (14); the fuel supply assembly (4) is configured to supply at least one first-stage fuel to the first-stage incinerator (11) such that the combustion stoichiometry of the first-stage incinerator (11) is unbalanced and there is an excess of first-stage fuel in the first-stage incinerator (11) to obtain unburned first-stage fuel reaching the second-stage incinerator (13).

The present application relates to the technical field of combustor, in particular to a kind of low-nitrogen combustor of roasting furnace natural gas based on cyclone and staged combustion, solve the problem that more nitrogen oxides can be produced in the combustor in the prior art;It includes outer sleeve, inner sleeve and inner core tube, the outer sleeve is sleeved on the outside of inner sleeve, air flow channel is formed between the outer sleeve and inner sleeve, the inner core tube is connected to the inside of inner sleeve, the inner sleeve is formed with natural gas flow channel through inner core tube, the inner wall of outer sleeve is formed with first rifling, the inner wall of inner sleeve is formed with second rifling, spiral groove is formed on the inner core tube and penetrates both ends;The scheme utilizes multiple rifling structures to make air and gas produce cyclone, improve mixing effect, enhance the radiation heat transfer effect of combustion in the furnace on furnace wall, increase the thermal efficiency of equipment, reduce energy waste, compared with conventional direct injection type combustor, NOx is reduced by 40.7%, and flame length is nearly 2 times of conventional direct injection type.

A aircraft gas turbine engine and operation method, the engine including: a staged combustion system having pilot and main fuel injectors, and operates in a pilot-only range wherein fuel delivers to pilot fuel injectors, and a pilot-and-main operation range wherein fuel is delivered to at least the main fuel injectors. The engine further includes a fuel delivery regulator to pilot and main fuel injectors, which receives fuel from a first and second source containing fuels each with different characteristics. The staged combustion system switches between pilot-only and pilot-and-main range operation when in steady cruise mode, the mode defining a boundary between first and second engine cruise operation range. The fuel delivery regulator delivers fuel to pilot fuel injectors during at least part of the first engine cruise operation with different fuel characteristics from fuel delivered to one or both pilot and main fuel injectors the second engine cruise operation range.

The application relates to the technical field of hydrogen fuel engines and discloses a hydrogen fuel staged combustion unit, a full-ring combustion chamber and an aero-engine. The hydrogen fuel staged combustion unit comprises a shell and a nozzle. An air flow cavity is formed in the shell. A combustion cavity is formed by the shell. The air flow cavity is communicated with the combustion cavity. The nozzle is provided with at least two nozzles. The at least two nozzles are arranged at intervals along the engine axis direction. The nozzle is arranged on the shell. A hydrogen fuel cavity is formed in the nozzle. The first end of the nozzle is adapted to communicate with hydrogen fuel. The second end of the nozzle is arranged in the combustion cavity. A group of injection holes are arranged on the nozzle. The group of injection holes is arranged close to the second end of the nozzle. The group of injection holes penetrates the nozzle to communicate the hydrogen fuel cavity with the combustion cavity. At least two nozzles are arranged along the engine axis direction. The hydrogen gas entering the combustion cavity is mixed with the air in the combustion cavity more sufficiently. The mixing uniformity of the hydrogen gas is improved. The temperature of the combustion cavity is reduced. The emission is reduced.

A combustor assembly (3) for a gas turbine unit (1) comprises at least one combustor unit (7) provided with a liner (16) extending substantially along a combustor axis (B); the combustor unit (7) comprising a first-stage combustor (8) and a second-stage combustor (9), which is arranged downstream the first-stage combustor (8) along the gas flow direction (G); the first-stage combustor (8) comprising a first-stage burner (11), fed with first-stage fuel and first-stage air, and a first-stage combustion chamber (12), where the first-stage fuel is burned; wherein the second-stage combustor (9) comprises a second-stage burner (13) and a second-stage combustion chamber (14); the second-stage burner (13) being arranged downstream of the first-stage combustion chamber (12); the second-stage combustion chamber (14) being fed with hot gas leaving the first-stage combustion chamber (12) and passing through the second-stage burner (13), with dilution air and with a second-stage fuel; wherein the dilution air and the second-stage fuel are injected simultaneously within the second-stage burner (13).

A hydrogen combustion-supporting liquid ammonia gas turbine combustor comprises a liquid ammonia fuel pipeline located at a center main shaft, a first-stage axial swirler and a first-stage radial swirler coaxially arranged outside the liquid ammonia fuel pipeline, and the swirler directions are the same and used for stabilizing the liquid ammonia flame. A pre-evaporation pipeline is arranged outside to form a hydrogen gas collecting chamber, and a center space of the pre-evaporation pipeline forms a primary air channel for completing pre-mixing swirl of liquid ammonia, hydrogen and air to stabilize the liquid ammonia flame. The pre-evaporated ammonia gas in the pre-evaporation pipeline enters a secondary air channel and completes pre-mixing swirl with air through a second-stage axial swirler. Secondary air holes are formed on a wall surface of a flame tube, a large amount of air enters to burn the fuel completely and improve combustion efficiency, and simultaneously dilutes tail gas to reduce NOx emission. The present application uses liquid ammonia as fuel, realizes stable liquid ammonia flame and reduces NOx emission through liquid ammonia fuel staging, hydrogen combustion-supporting, multi-stage swirl pre-mixing and staged combustion.

The application discloses a multi-layer dispersion combustion, high-efficiency energy-saving yellow phosphorus tail gas low-nitrogen burner and a multi-stage combustion method, and belongs to the technical field of energy saving and environmental protection. The mounting flange of the burner is connected with a furnace chamber. The burner comprises a cylinder body, the cylinder body is divided into a fuel cavity and a combustion-supporting cavity which are relatively independent through a transverse partition plate, the fuel cavity is used for conveying yellow phosphorus tail gas, and the combustion-supporting cavity is used for conveying high-pressure and high-speed combustion-supporting air. A center gun is arranged at the center of the cylinder body, an inlet end of the center gun is communicated with the fuel cavity, a plurality of layers of spray gun pipes are arranged, nozzles of a part of the spray gun pipes are staggered in height, and the nozzles of the spray gun pipes are oriented in different directions; a part of the spray gun pipes are provided with rotating blades; an air automatic rotating assembly is arranged at the outer periphery of an outlet end of the center gun and is communicated with the combustion-supporting cavity, and the air automatic rotating assembly is used for automatically and rapidly rotating the combustion-supporting air, so that the combustion-supporting air and the yellow phosphorus tail gas are fully mixed. The application solves the problems of yellow phosphorus tail gas ultra-low NOx and CO emission and yellow phosphorus tail gas blockage.

The dual-fuel engine piston capable of reducing methane emission comprises a piston body, a concave pit is formed in the top face of the piston body to serve as a combustion chamber, the top face of the piston body is connected with the side face of the piston body through a flow guide face, and the combustion chamber is communicated with the flow guide face through a plurality of vortex grooves. A set included angle is formed between the vortex groove and the tangent line of the outer circumference of the combustion chamber; according to the utility model, the flow guide surface is arranged between the piston top surface and the piston side surface, so that natural gas in the backlash can be guided into the combustion chamber for combustion, and methane emission is further reduced. A vortex groove is formed in the top face of the piston, natural gas in a side gap passes through a flow guide face to a motion chamber in a combustion chamber and inevitably passes through the vortex groove, airflow is guided by the vortex groove to form a certain vortex in a cylinder, later-stage combustion is accelerated, combustion is more sufficient, and methane emission is further reduced.

The pyrolysis incinerator comprises a pyrolysis chamber provided with a conveying device, the input end of the conveying device is located below a feeding port, and the output end of the conveying device extends to the output end of the pyrolysis chamber; an inner cavity of the multi-stage combustion chamber is divided into a falling combustion chamber, a movable combustion chamber and a gas combustion chamber, the top of the falling combustion chamber is communicated with the output end of the pyrolysis chamber, the bottom of the falling combustion chamber is communicated with the gas combustion chamber through the movable combustion chamber, an inclined plane is arranged in the movable combustion chamber, and the top end of the inclined plane is located below the falling combustion chamber; the bottom end of the inclined surface obliquely extends downwards to the slag discharging opening; and the air distribution mechanism is communicated with the multi-stage combustion chamber. According to the invention, pyrolyzed products can be combusted more sufficiently, residues are less, the requirement for subsequent treatment of the residues is reduced, generation of harmful gases can be reduced, the garbage treatment efficiency can be effectively improved, the structure is compact, and the operation is simple.

The utility model discloses an energy-saving burner with a multi-stage airflow mixing structure, which belongs to the technical field of burners and comprises a gas main pipe, a connecting base communicated with the gas main pipe and a burning head sleeve mounted on the outer side of the connecting base. A gas branch pipe is installed on the connecting base, a gas small hole is formed in the top end of the gas branch pipe, an internal thread is arranged on the inner wall of the gas branch pipe, an ignition hole is formed in the middle of the connecting base, a combustion-supporting pipe is arranged on the outer side of the gas branch pipe in a sleeving mode, and the bottom end of the combustion-supporting pipe is fixedly connected with the connecting base. Small combustion-supporting holes are formed in the side wall of the combustion-supporting pipe in an array mode, so that the problems of scale deposition and rusting in the fuel gas branch pipe can be prevented, pipeline blockage is effectively prevented, meanwhile, the flame jetting range is increased, mixing of fuel and air is promoted in the first-stage combustion area, and sufficient combustion of the fuel can be guaranteed.

The present application relates to the technical field of combustion equipment, and particularly relates to a rotary backflow carbon and steam co-production low-nitrogen combustion equipment and a combustion method, which comprises a combustion furnace assembly, a cracking carbonization furnace and a heat exchanger, the cracking carbonization furnace is connected with a carbonization tail gas recovery pipeline and a cracking gas delivery pipeline, and the combustion furnace body of the combustion furnace assembly is connected with the output ends of the carbonization tail gas recovery pipeline and the cracking gas delivery pipeline; the combustion furnace body is internally provided with a first-stage combustion zone and a second-stage combustion zone, and the first-stage combustion zone is located in front of the second-stage combustion zone. x The present application generates the source of NO x xidation (NO x ) emission without relying on complex end denitration equipment, and easily meets the environmental protection emission standard; meanwhile, the carbonization tail gas and the boiler tail gas are both used in the system, so that the amount of directly discharged tail gas is reduced.

The invention discloses a low-emission dry-process cement production line based on staged combustion, and relates to the field of dry-process cement production, the low-emission dry-process cement production line specifically comprises a crushing box, a conveyor and a grinding box, the grinding box is connected with a drying box through a vacuum feeding machine I, and the drying box is connected with an air homogenizing box through a vacuum feeding machine II; in the cement clinker conveying link, the motor drives the conveying belt to operate, the side limiting rollers transmit along with the conveying belt, the driving rod drives the crushing rods to rotate through the connecting shaft, the transmission shaft and the transmission piece, clinker crushing and mixing are achieved, meanwhile, the V-shaped sieve plate intercepts caked clinker and guides the caked clinker to the crushing triangular area, the multiple groups of crushing rods work efficiently, the crushing uniformity is improved, and the crushing efficiency is improved. In addition, the transmission shaft drives the fan to rotate, the airflow cools the crushing area through the temperature maintaining pipe, waste heat generated by caking and crushing is eliminated, the situation that the follow-up process stability and the product quality are affected by high temperature is avoided, crushing, screening and temperature control cooperation is achieved, and the cement clinker treatment efficiency and the finished product quality are effectively improved.

1. Name of the product in this design: Complete set of equipment for two-stage combustion technology. 2. Purpose of this design: for waste incineration. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D rendering 2. 5. The bottom surface of this product is a part that is not easily seen or cannot be seen during use, so the bottom view is omitted.

The invention discloses a subcritical boiler energy efficiency optimization method based on a multi-stage combustion technology, and belongs to the field of boilers, and the method comprises the following steps: S1, system construction: constructing a subcritical boiler energy efficiency optimization system based on the multi-stage combustion technology, the system comprises a main combustion zone combustor, a reduction zone combustor and a burnout zone combustor which are arranged in a layered manner along the height of a hearth, a matched air powder conveying system and an intelligent control system integrated with a multi-dimensional sensor array are adopted, and all combustors are designed in a differentiated structure so as to meet the requirements of corresponding combustion stages. According to the subcritical boiler energy efficiency optimization method based on the multi-stage combustion technology, through staged combustion design, high-concentration pulverized coal injection and tertiary air disturbance intensified burnout are combined, the fuel burnout rate is greatly increased, and mechanical incomplete combustion heat loss is reduced; meanwhile, the heat absorption efficiency of the heating surface is optimized through dynamic regulation, smoke exhaust loss is reduced, and the boiler heat efficiency is comprehensively improved.

The invention relates to the technical field of combustion, in particular to a staged combustion device of a plasma combustion system, which comprises a plasma combustor connecting pipe, and a treatment assembly for treating impurities in hot air flow is arranged on a fixed arm. In the normal combustion and gas production process of the staged combustion device of the plasma combustion system, when hot airflow containing iron oxide solid particles flows through the pulverized coal inlet pipe, the movable bolt and the treatment table drive the scraper to continuously rotate along the surface of the filter disc, and the iron oxide solid particles remaining in the hot airflow can be accurately intercepted; the turbine blades are prevented from being impacted by high-speed hot air; when the cleaning operation is carried out during equipment shutdown or low-load operation, the scraper generates periodic vibration under the action of jacking of the starting contact strip and reset of the spring, particles clamped in meshes of the filter disc are effectively loosened and discharged, blockage is avoided, and the dual functions of protection in operation and blockage clearing after shutdown are achieved.

The utility model discloses combustion waste gas multistage purification equipment which comprises a spraying purification box, the two sides of the spraying purification box are connected with a smoke inlet pipe and a gas outlet pipe in a penetrating mode respectively, the side, away from a first filter box, of the smoke inlet pipe is fixedly provided with the first filter box, and an anti-blocking assembly is arranged in the first filter box. A dust collection box is fixedly mounted at the bottom of the first filter box, and a second filter box is fixed to the side, close to the air outlet pipe, of the spraying purification box through a mounting plate. When the multi-stage purification equipment for the combustion waste gas is used, the waste gas entering the spraying purification box is filtered through the interior of a first filter box, the waste gas is conveniently filtered through an arranged anti-blocking assembly, the output end of a motor rotates to drive a reciprocating lead screw to rotate, and then a brush is driven by a sliding block to move up and down on the surface of a filter screen plate; and the surface can be brushed conveniently, and the filter screen plate can be prevented from being blocked by impurities.

A method for combusting fuel in stages by feeding combustion air (28) into a burner tube (12). A first fuel quantity is fed to form a primary flame (24) in the burner tube. A second fuel quantity is fed downstream to form a main flame front (26). The main flame front (26) stabilizes downstream of the burner tube (12) and is spaced apart from the burner tube (12). The fuel feed is designed such that the primary flame (24) burns at a stoichiometric ratio greater than 1.5, in particular greater than 2.0.