501 results about "Soot" patented technology

The invention discloses a high-bismuth slag and precious lead co-processing and efficient recycling method, and belongs to the technical field of non-ferrous metallurgy. High-bismuth slag and precious lead are mixed to obtain impurity-removed precious lead through impurity removal processes such as plug-blow antimony removal, liquation copper removal and tellurium removal by adding agents, and the impurity-removed precious lead is subjected to an oxidation refining process to obtain gold-silver alloy to recover precious metal. Bismuth and lead are similar, silver can be infinitely dissolved in a molten state, and the silver trapping agent has good silver trapping capacity. The high-bismuth slag and the precious lead are mixed to greatly reduce the temperature of a system, volatilization and unknown loss of metal such as Ag are reduced, energy consumption is remarkably reduced, the production cost is reduced, the recovery rate of metal such as bismuth, antimony and silver is increased, and the production efficiency is improved. The obtained molten slag is used for smelting high-bismuth slag, the obtained soot is used for smelting crude antimony, and efficient cyclic utilization of rare and precious metal resources is achieved.

The invention discloses an in-cylinder flame multi-characteristic parameter extraction and instantaneous evaluation method based on machine learning, and belongs to the technical field of power energy. Aiming at the problem that a traditional method is difficult to accurately extract flame transient characteristic parameters in a dynamic combustion environment, the method comprises the following steps: acquiring an in-cylinder flame image sequence through an endoscopic high-speed camera, and extracting an event driving key frame and a uniform time key frame by adopting optical flow analysis and fixed interval sampling; utilizing a double-flow feature extraction network to respectively obtain flame spatial form features and radiation features; capturing a flame parameter time evolution law through a time sequence convolutional network, and dynamically fusing key frame features in combination with a self-attention mechanism; and finally outputting flame temperature field and soot distribution prediction results. According to the method, instantaneous evaluation of the combustion process is realized, and a basis is provided for engine performance optimization and combustion fault diagnosis.

The invention discloses a photovoltaic panel ash deposition density inversion method fusing mixed pixel abundance estimation, and belongs to the technical field of hyperspectral remote sensing and environment monitoring. Acquiring all hyperspectral image data of different ash deposition densities from a complete cleaning state image to a complete ash covering state of the photovoltaic panel, and taking images at two ends in the hyperspectral image data as pure end member spectrums; constructing a spectrum enhancement index; the method comprises the following steps: constructing a mixed pixel model of photovoltaic panel dust deposition by using a pure end member spectrum, performing spectral unmixing on the mixed pixel model to obtain an abundance coefficient of a photovoltaic panel and a dust deposition component, and substituting the abundance coefficient into a K nearest neighbor (KNN) model to realize accurate inversion of the photovoltaic panel dust deposition density; and the precision evaluation of the quantitative inversion result of the ash deposition density of the photovoltaic panel is realized. The method has higher precision, stability and generalization ability in a complex ash deposition environment, and provides reliable support for intelligent operation and maintenance of a photovoltaic power station.

The invention discloses an energy-saving boiler, and relates to the technical field of boilers, the energy-saving boiler comprises a boiler body and a smoke exhaust pipeline mounted on the boiler body, the energy-saving boiler further comprises an air preheater mounted at the tail end of the smoke exhaust pipeline, and a pair of heat exchange pipe sets distributed in the smoke exhaust direction is mounted in the air preheater; the heat exchange tube set is composed of a plurality of heat exchange tube bundles, expanding parts and reducing parts which are alternately distributed along the axes of the heat exchange tube bundles are arranged on the heat exchange tube bundles, spiral flow deflectors and movable cleaning frames with upper and lower openings are arranged on the inner walls of the reducing parts, and the movable cleaning frames are movably installed in the heat exchange tube set and provided with through holes allowing the heat exchange tube bundles to penetrate through. Annular cleaning turbulent flow pieces corresponding to the heat exchange tube bundles are rotationally installed in the movable cleaning frame. By arranging the movable cleaning frame and a plurality of annular cleaning turbulent flow pieces in the movable cleaning frame, the outer wall of the heat exchange tube bundle can be continuously scraped in the moving process, and compared with a traditional soot blowing mode, the mechanical scraping mode is more thorough in soot cleaning.

The invention belongs to the technical field of thermal power generation intelligent control, and discloses a boiler heating surface soot blowing opportunity judgment method and device, equipment and a medium, an input signal is constructed according to the load change rate, a compensation coefficient is output through a trained correction model, a boiler heating surface cleaning factor is compensated, and a soot blowing opportunity judgment result is obtained. Identifying that the boiler is in a statistical controlled stable operation interval, collecting historical measurement values of the compensation cleaning factor under various working conditions, and determining a safe operation lower limit; performing sliding window filtering processing on the current measurement value of the compensation cleaning factor to obtain a target cleaning factor; and if the target cleaning factor is continuously lower than the safe operation lower limit and exceeds the set duration, generating a soot blowing trigger instruction, thereby realizing dynamic compensation of the cleaning factor in a rapid variable load state and accurate screening of the stable operation state of the boiler, reducing misjudgment of the soot blowing opportunity, improving the accuracy of determination of the soot blowing opportunity of the heating surface of the boiler, and improving the reliability of the soot blowing opportunity. And intelligent control over soot blowing operation is improved.

The invention relates to the technical field of sampling purging, and discloses a sampling pipeline purging auxiliary device. The supporting mechanism comprises a sampling sleeve, a soot blowing end fixedly arranged at the top of the sampling sleeve, a conveying rod at the bottom of the soot blowing end, and a cleaning end elastically connected with the bottom of the soot blowing end; the gas guide mechanism comprises a moving cavity formed in the sampling sleeve, a sealing block fixed at the bottom of the moving cavity, a transmission plate sliding along the inner wall of the sealing block, and an adjusting plate which is in torsion connection with the inner wall of the sampling sleeve and is positioned above the transmission plate; the reset mechanism comprises an air pressure module fixedly arranged on the outer wall of the sampling sleeve and a starting block embedded in the inner wall of the sampling sleeve. And the cleaning end head can effectively treat condensed blocks and can be matched with compressed air flow entering the cleaning end head in the resetting process, residual dust on the surface of the cleaning end head can be cleaned by the way, and the effect of active maintenance can be achieved. Intermittent cleaning can be achieved without continuously inputting compressed air, energy is saved, and meanwhile cleaning is remarkably improved.

The invention relates to an intelligent sound wave soot blowing method, system and terminal for a coal-fired boiler flue, and belongs to the technical field of coal-fired boiler flue cleaning.The intelligent sound wave soot blowing method comprises the steps that environmental parameters in the coal-fired boiler flue are monitored in real time; calculating sound wave parameters according to the environmental parameters; according to the sound wave parameters, a sound wave emitter is controlled to emit needed sound waves to a flue; the ash removal effect of accumulated ash in the flue is monitored; and according to the feedback ash removal effect, sound wave parameters are optimized so that sound wave energy can be evenly distributed in the flue. The flue dust removal device has the beneficial effect that the dust removal efficiency of the flue of the coal-fired boiler is improved.

A hydrocarbon stream is combusted within a reactor to produce soot and syngas. Sub-stoichiometric combustion of the hydrocarbon stream within the reactor converts at least 10% of the carbon in the hydrocarbon stream into soot. The syngas is mixed with a steam stream to produce a hydrogenation feed stream. A shift reactor converts at least a portion of the carbon monoxide and steam to carbon dioxide and hydrogen to produce a shifted gas stream. Water is separated from the shifted gas stream to produce a dehydrated gas stream. The dehydrated gas stream is separated to produce a hydrogen product stream and a recycle stream. The recycle stream is recycled to the reactor.

The invention belongs to the technical field of power station boiler operation monitoring, and particularly relates to an on-line monitoring method and system for ash and slag on the heating surface of a boiler, and the method comprises the following steps: image acquisition and light spot positioning: capturing an original image in real time, carrying out the preprocessing, and extracting a light spot region; fitting a laser path to obtain a two-dimensional pixel coordinate in an image coordinate system; parameter acquisition and three-dimensional reconstruction: calling an internal reference matrix of a pre-calibrated image acquisition device, synchronously acquiring external parameter data measured and output by an attitude sensing device in real time, resolving an observation ray under a camera coordinate system, converting to a world coordinate system, and reconstructing a three-dimensional coordinate of a laser drop point under the world coordinate system; and thickness calculation and evaluation and result output and intelligent control are carried out. According to the invention, the thickness and the distribution range of ash slag on the heating surface of the boiler can be directly, accurately and online monitored in real time, so that a timely and reliable decision basis is provided for refined operation and intelligent ash blowing of the boiler.

This invention discloses a boiler load adaptive regulation system based on solid thermal storage, relating to the field of power plant boiler combustion technology. The invention includes a boiler with an economizer arranged in its tail flue, and a flue gas extraction pipe connecting the boiler and the economizer. The end of the flue gas extraction pipe is connected to an ash separation component, the outlet of which is connected to the flue gas inlet of a solid thermal storage component, and the flue gas outlet of the solid thermal storage component is connected to the air preheater inlet. This invention extracts high- and medium-temperature flue gas from different locations in the boiler during rapid load reduction, stores the heat from the high-temperature flue gas using solid thermal storage technology, and releases the heat from the solid thermal storage component when rapid load increase is needed. This heat is then used to increase the primary air temperature and pulverized coal temperature through a heat exchanger, enhancing the combustion intensity of pulverized coal in the furnace. By reducing the amount of high-temperature flue gas in the boiler, the load change rate of the unit is effectively improved.

The invention relates to the technical field of tail gas treatment, in particular to a tail gas treatment structure of a movable diesel generating set. Comprising a supporting seat and further comprises a cyclone separator, a first barrel, a flow guide part, a second barrel, a third barrel, a vibration part, a driving part and the like. Through cooperative cooperation of the cyclone separator, the impingement plate, the flow guide part, the vibration part and the driving part, in the tail gas treatment process, the cyclone separator separates and collects large particles, the impingement plate enables airflow to uniformly enter DOC for oxidation, the flow guide part sweeps high-temperature gas to the end face of the DPF to form uniform heating, and the tail gas treatment effect is improved. The vibration part transmits vibration to the DPF through the vibration transmission rod so that a soot layer can be loosened, and the driving part drives the flow guide part to rotate and the vibration part to work at the same time. Therefore, the problems that in the prior art, an ash-carbon composite layer formed by ash accumulation hinders regeneration heat transfer, and a soot layer is compacted compactly under the low-load working condition, so that regeneration starting is difficult, and heat spreading is slow are systematically solved.

This disclosure concerns a method of extracting vanadium, comprising mixing carbon soot ash with a leaching agent and an oxidising agent in a polar solvent in order to form a mixture and reacting the mixture in order to form vanadium 5 (V) ions; filtrating the mixture in order to separate a vanadium leachate from a leached ash; and purifying the vanadium leachate in order to obtain a vanadium filtrate. A weight ratio of carbon soot ash to polar solvent is about 1:2 to about 1:10. A mole ratio of leaching agent to oxidising agent is about 2:0.3 to about 2:2. This disclosure concerns a method of producing vanadium pentoxide.

The utility model relates to the field of environmental protection equipment, in particular to an ash removal port plug easy to disassemble. The utility model provides a deashing port plug easy to disassemble. The deashing port plug easy to disassemble comprises a plug body, a conical head, a limiting rod, a guide plate, a first spring, a support, a two-way screw, a rotating block and the like. A conical head is installed at the top of the plug, limiting rods are installed on the two sides of the plug, guide plates are arranged on the limiting rods in a sliding mode, the limiting rods are sleeved with first springs, the two ends of the first springs are connected to the plug and the guide plates respectively, supports are installed on the two sides of the guide plates, and two-way screws are rotationally connected between the supports on the two sides. A rotating block is installed in the middle of the two-way screw. The plug has the advantages that the guide plate is arranged and can play a guiding role when the plug is plugged into the ash removal opening, the plug can be directly pulled out during disassembly, and the effect that the plug is convenient to disassemble is achieved.

This oil evaluation device is provided with a calculation processing unit that calculates, on the basis of a measurement result of the density of oil in an internal combustion engine, the proportion of soot mixed into the oil as an evaluation index.

This invention discloses a method for testing the anti-coking performance of diesel engine oil in turbochargers. The main design concept of this invention lies in designing a full-process test based on engine operation, including high smoke conditions, low temperature and low load conditions, high temperature and high load conditions, and multiple rounds of cyclic testing to simulate the high and low temperature fluctuations of engine oil. This achieves a comprehensive assessment of the impact of engine oil performance changes on turbocharger coking. Furthermore, engine oil sampling is performed at predetermined stages to monitor relevant physicochemical properties. Further, the turbocharger is disassembled and evaluated after the test procedure, enabling an accurate evaluation of the engine oil's anti-coking performance. This facilitates the matching development of engine oils during engine development and avoids problems such as turbocharger damage and reduced power caused by using unsuitable engine oil. This invention comprehensively covers soot dispersion, high-temperature shear resistance, and temperature oscillation, providing significant guidance for the comprehensive evaluation of engine oil's anti-coking performance.

The invention discloses an efficient passive regeneration SDPF catalyst and a preparation method thereof. The catalyst comprises a high-void wall flow type DPF carrier, a front area coating and a rear area coating, wherein the front area coating and the rear area coating are coated on a front area and a rear area of the DPF carrier respectively and are connected with each other; the median pore diameter of the high-void DPF carrier is 15-25 [mu] m, and the porosity is 55-70%; the front area coating is an SCR active coating and is distributed on the outer wall of the air inlet side of the DPF carrier and in a pore channel; and the rear-area coating is a soot oxidation active coating containing noble metal and is distributed in the pore channel of the DPF carrier. On the premise that the NOx conversion efficiency of SDPF is not affected, the catalyst can improve the passive regeneration oxidation rate of soot at the same time, and the effect of synergistically promoting NOx reduction and soot oxidation is achieved.

A method for measuring the deep peak regulation load of a coal-fired boiler in an electric power auxiliary service market comprises the steps that preparation before testing is conducted, specifically, the quality of coal entering the boiler is selected, and all devices in a boiler system are verified; coal with the selected coal quality is put into the boiler to be combusted, and when the boiler load reaches or exceeds the soot blowing threshold value, soot blowing is conducted on the heating surface of the boiler comprehensively; after soot blowing is finished and a preset stable combustion condition is met, the boiler load is gradually reduced according to a preset rule; in the process of reducing the boiler load, monitoring each parameter of each device, and when each parameter exceeds a corresponding safety limit value, determining whether the abnormity is recoverable or not and determining the abnormity type; and for recoverable anomalies, the boiler load is gradually increased according to the type of the anomalies until the parameters are kept stable under the current boiler load for a preset time length, and the current boiler load reaching the preset time length serves as the deep peak regulation load lower limit. The power dispatching accuracy and the operation efficiency of the peak regulation market can be improved, and a reliable basis is provided for dispatching decision making.

The invention discloses a method for recovering copper from high-arsenic matte and enriching arsenic and lead. The method comprises the steps that the high-arsenic matte and quartz sand are fully mixed according to a first set proportion and then added into a smelting furnace; natural gas and oxygen are continuously introduced into the smelting furnace for a heating smelting reaction, air is continuously blown in the heating smelting reaction process, and slag is discharged once every set time; and after slagging is completed, limestone is added to remove arsenic, meanwhile, the temperature in the smelting furnace is gradually increased to 950 DEG C, the temperature in the smelting furnace is kept at 950 DEG C till the content of arsenic in the materials is smaller than 1%, at the moment, arsenic enters smoke, and ash is produced after dust collection. According to the method provided by the invention, the high-arsenic matte obtained through treatment in a lead smelting enterprise can be recycled in a targeted manner, so that lead, antimony, gold, silver, arsenic and the like in the high-arsenic matte are recycled after being classified, and the aims of deeply treating the high-arsenic matte and enriching and extracting various valuable metal elements in a classified manner are fulfilled.

An oil evaluation unit 20 comprises a computing processor unit 23, which is designed to calculate a mixing ratio Ws of soot in the oil as an evaluation index on the basis of a measurement result of the density of oil in an internal combustion engine 3.

A method for transient operation, such as start-up or shut-down, of a burner of a partial oxidation reactor in which, under normal conditions, the burner is operated using a carbon-containing gaseous fuel and the fuel is combusted in the presence of oxygen in a combustion chamber, in which the method comprises replacing the fuel with hydrogen during transient operation, therefore, the formation of smoke dust is reduced.

The application provides an anti-ash blocking structure for a non-metal expansion joint of a coal-fired boiler flue, and belongs to the technical field of ash treatment of the coal-fired boiler flue expansion joint. In the application, a guide plate gap exists between a first expansion joint guide plate and a second expansion joint guide plate, a flexible ash blocking structure is connected to the first expansion joint guide plate and the second expansion joint guide plate respectively, the flexible ash blocking structure is a bending structure, the flexible ash blocking structure is composed of stainless steel wire meshes and high-temperature-resistant ceramic fiber cotton, and the high-temperature-resistant ceramic fiber cotton is filled in the middle of the two layers of stainless steel wire meshes. The application can avoid damage of the non-metal expansion joint of the coal-fired boiler flue caused by ash accumulation, and effectively prolong the service life of the non-metal expansion joint of the flue.

The present invention provides a gas burner device and a cooking appliance that can suppress the accumulation of soot on heated objects such as cooking containers due to the yellow flame generated in the sub-burner section immediately after the transition from a simultaneous combustion state to a single combustion state. [Solution] In a gas burner device 16 having a main burner section 36 and a sub-burner section 38, where the minimum heat output in a simultaneous combustion state when the main burner section 36 and the sub-burner section 38 burn simultaneously is greater than the maximum heat output in a single combustion state when only the sub-burner section 38 burns, but the minimum simultaneous combustion heat output opening of the gas volume control valve 55 is set to be smaller than the maximum single combustion heat output opening, the control means 60 closes the on / off valve 56 when the opening of the gas volume control valve 55 is smaller than the maximum single combustion heat output opening and is greater than or equal to the minimum simultaneous combustion heat output opening, thereby switching the combustion state of the burner 39 from a simultaneous combustion state to a single combustion state.

1. The name of the design product: multifunctional smoke dust sampler. 2. The use of the design product: portable sampler for quickly collecting particulate matters in flue gas. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

The utility model discloses a portable second-hand smoke purifying device which comprises a shell, a smoke cover and a base, the smoke cover and the base are matched with the shell, a turbofan, a drawable cigarette ash collecting box and a filtering assembly are sequentially arranged in the shell from top to bottom, and smoke collecting, tar particle separating, cigarette ash collecting, tar gathering and tar guiding are achieved. And finally, the smoke is purified and discharged, so that harmful substances in the smoke can be completely removed, and the smoke taste in the smoke can be removed. During operation, tar in smoke is separated through the turbofan, and the separated tar is collected, so that the tar is prevented from blocking the filtering part, and the service life of the purification device is prolonged; meanwhile, the oil guide pipe with holes and the oil guide groove is adopted, it is guaranteed that smoke penetrates through the oil guide pipe and is filtered through the filtering part while tar is collected, finally, the smoke is exhausted from the exhaust hole through the odor removing cotton, and the device has the advantages of being good in filtering effect, not prone to being blocked and long in service life.

The utility model belongs to the technical field of tail gas emission aftertreatment, and relates to a rapid soot loading device of a diesel particulate filter, which comprises a diesel particulate filter body, one side of the diesel particulate filter body is provided and connected with an exhaust pipe, one end of the exhaust pipe is provided and connected with a fuel heater, and the other end of the exhaust pipe is provided and connected with a diesel engine. A pressure sensor and a particulate matter sensor are connected to the middle of the exhaust pipe, an air inlet is formed in one end of the fuel heater, an oil inlet path is connected to the middle of the fuel heater, and an oil storage tank is connected to one end of the oil inlet path. According to the system, automatic back pressure adjustment can be achieved, so that the soot loading time is shortened, the rapid soot loading effect is achieved, manpower, materials and time cost are greatly saved, sufficient soot loads can be provided for a regeneration test of a diesel particulate filter body through rapid soot loading, and the system is suitable for large-scale popularization and application. Therefore, research and optimization of the regeneration process are accelerated.

The utility model discloses a kind of briquettes suitable for anti-accumulation of dust assembly, including briquette body, laminated part and frame, the briquette body includes two kinds of middle pressure and side pressure, the middle part of briquette body is equipped with mounting groove, the side of briquette body integrally formed with briquette assembly, the bottom of briquette assembly is hingedly arranged with pressing plate, pressing plate upper end integrally formed with carding member profile, the position of briquette assembly bottom carding member profile is equipped with clamping groove, the bottom of pressing plate integrally formed with three element ethylene propylene rubber.The utility model relates to a kind of briquettes suitable for anti-accumulation of dust assembly, solves the problem of hot anti-accumulation of dust assembly installation on market, and the installation step of conventional assembly is identical, need not add installation step, applicable to single glass or double glass assembly, non anti-accumulation of dust assembly can also be universal, power station end is free from switching, alleviate inventory pressure, EPDM exceeds briquette effectively avoid cutting surface when assembly is stressed to glass, more safe.

The utility model discloses a smoking oven with adjustable smoke output, which relates to the field of aromatherapy ovens and comprises an oven body, the upper end of the oven body is provided with an opening, a smoke exhaust oven cover is detachably mounted in the opening, the bottom surface of the smoke exhaust oven cover is provided with an air supply component used for driving airflow to blow upwards, and an incense placing plate is arranged below the smoke exhaust oven cover. When the generated smoke is too large, the adjusting cover is installed on the upper surface of the smoke discharging furnace cover, at the moment, the air outlet grooves in the surfaces of the adjusting cover and the smoke discharging furnace cover are staggered, formed through holes become small, and then the smoke discharging amount is adjusted; after the incense coil is burnt out, the scraper at the lower end of the scraping rod is driven by rotating the scraping rod to abut against the surface of the incense containing plate, incense ash on the surface of the incense containing plate is scraped off, the ash is prevented from being attached to the furnace body in the whole cleaning process, the cleaning effect is clean and thorough, and practicability is improved.

This utility model relates to the field of flue dust removal technology, and in particular to a water-sealed flue dust removal device, comprising: a water tank that slides below the flue via a sliding mechanism, wherein the ash discharge pipe of the flue extends into the water tank; wherein the water tank includes four peripheral surfaces and an ash-accumulating bottom surface and a sealing bottom surface connected between the bottoms of the four peripheral surfaces, the sealing bottom surface being located above the ash-accumulating bottom surface. This utility model's dust removal device uses the water tank to water-seal the bottom of the ash discharge pipe, allowing the soot in the flue to fall into the water tank for collection. After collection, the position of the water tank can be changed to move it to one side for dust removal. During the dust removal process, the sealing bottom surface water-seals the bottom of the ash discharge pipe again to ensure operational safety during the dust removal process, achieving online cleaning of flue dust accumulation. The overall structural design is simple, effectively improving the convenience of flue dust removal operations.

The utility model belongs to the technical field of non-woven fabric production, and discloses a non-woven fabric packaging and cleaning device which comprises a rack, a conveying mesh belt is installed on the rack, a cleaning assembly is installed at the position, corresponding to the conveying mesh belt, of the rack, the cleaning assembly comprises a lifting assembly arranged on the rack, the lifting assembly is connected with a transparent cover, and the transparent cover is connected with the conveying mesh belt. By arranging the first soot blowing assembly and the second soot blowing assembly, air can be blown to the top face, the bottom face and the side face of the non-woven fabric package, dirt such as dust attached to the outer surface of the non-woven fabric package is taken away through high-speed flowing airflow, cleaning is more comprehensive, no dead angle exists, and cleaning of the non-woven fabric package is facilitated; according to the non-woven fabric packaging bag, dust can be adsorbed, the situation that the dust escapes to the surrounding air is reduced, pollution to the surrounding air is avoided, and the situation that the dust is attached to other cleaned non-woven fabric packaging bags can also be reduced.

The application belongs to the technical field of ship energy saving and emission reduction, and particularly relates to a ship energy saving and emission reduction device, which comprises a box body, a first flange pipe opening, a first flange pipe opening communicated and arranged on one side end face of the box body, a filter screen plate for filtering soot elastically arranged in the box body on one side of the first flange pipe opening, a cleaning assembly for cleaning soot slidingly arranged on the two side walls of the filter screen plate, a first-stage recovery assembly arranged between the filter screen plate and the first flange pipe opening, a purification assembly detachably arranged in the box body on one side of the filter screen plate, a second-stage recovery assembly arranged in the box body on one side of the purification assembly, and a second flange pipe opening communicated and arranged on the end face of the box body on one side of the second-stage recovery assembly. In the application, the first-stage recovery assembly and the second-stage recovery assembly both recycle and process the high-temperature heat in the waste gas. The first-stage recovery assembly uses the high-temperature waste gas to complete the distillation of seawater, and the second-stage recovery assembly uses the residual heat to complete the preheating treatment of fuel, so that the fuel combustion effect is improved.