33 results about "Combustion noise" patented technology

The invention discloses a strong premixing combustion chamber for restraining combustion noise based on a Helmholtz resonant cavity, and relates to the technical field of energy and power. Air and fuel enter the mixing cavity through corresponding connectors to be strongly premixed, premixed gas enters the hearth to be combusted through slit channels among water cooling channel branch pipes, a water cooling channel array can prevent backfire, the Helmholtz resonant cavity is connected with the hearth through a cavity neck and is provided with an air film cooling channel, the size of the Helmholtz resonant cavity needs to measure combustion noise, and a frequency spectrum is analyzed to obtain characteristic frequency. The neck length, the cross section area and the resonant cavity volume are calculated according to a Helmholtz resonance formula, and the sound absorption effect is verified in combination with a low-order thermoacoustic model. Combustion efficiency is improved through the strong premixing and slit water cooling design, tempering is prevented, NOx is reduced, the diffusion combustion problem is solved, the targeted design resonant cavity is matched with air film cooling, the defects that an existing silencing structure is large in size, poor in adaptation and low in high-temperature reliability are overcome, complex active control is not needed, cost is low, applicability is high, and the application range is wide. And cooperative control of high efficiency, low emission and unstable combustion is realized.

The application discloses a noise control method, system and device of a micro engine and a storage medium, belongs to the technical field of engine noise control, and solves the technical problem that the micro engine is difficult to achieve an ideal noise reduction effect. The method is: collecting intake / exhaust noise, mechanical noise and combustion noise data in the working process of the micro engine, and performing empirical mode decomposition to decompose the noise signal into a plurality of IMF components of intrinsic mode functions; an LSTM neural network model is constructed; the LSTM neural network model is trained to obtain an EMD-EGMGWO-LSTM model; in the working process of the micro engine, noise data is collected in real time and input into the trained EMD-EGMGWO-LSTM model to obtain a predicted value of the noise data; and an anti-phase noise control signal opposite in phase and matched in amplitude is generated in real time to achieve an efficient active noise reduction effect. The control strategy can be continuously optimized and adjusted, and the noise reduction effect is improved.

Disclosed in the present invention is a lower-blower gas water heater, comprising a housing, a heat exchanger, a burner and an air blower. The burner comprises a housing and a plurality of rich-lean burner rows; a plurality of first air inlets and a plurality of second air inlets are provided on one side of the housing; vents are provided at the bottom of the housing; a first ejection tube and a second ejection tube are provided on one side of each burner row; a rich flame flow channel and a lean flame flow channel are provided in each burner row; each lean flame flow channel comprises a plurality of first air supply channels and a plurality of second air supply channels, the second air supply channels being distributed on two sides of each first air supply channel; each lean flame flow channel is configured such that the airflow resistance generated by the first air supply channels is greater than the airflow resistance generated by the second air supply channel; each second injection tube is provided with a plurality of air outlet holes, and leads to the rich flame flow channel by means of the plurality of air outlet holes; the areas of the plurality of air outlet holes tend to increase in the air flow direction in the second injection tube. The flame stabilization effect is optimized to improve flame combustion stability and reduce combustion noise.

The invention belongs to the technical field of noise elimination and flame suppression equipment, and particularly discloses a noise elimination and flame suppression device which comprises a noise elimination and flame suppression shell, the noise elimination and flame suppression shell is in a hollow ring shape, the noise elimination and flame suppression shell is filled with a noise elimination and flame suppression agent, and the noise elimination and flame suppression shell can be crushed under the action of high-temperature and high-pressure fuel gas. The two-phase mixed combustion noise reduction and flame reduction technology is adopted, so that the emission noise is greatly reduced, when the initial velocity of a bullet is about 200 m / s, the emission noise can be reduced to 170-175 decibels under the open field condition, the noise can be reduced to 180-185 decibels when the bullet is emitted in a limited space, the emission noise can be remarkably reduced, the sound pressure can be reduced to 1 / 3 of the sound pressure which is not additionally provided with the noise elimination and flame reduction device, and the noise reduction and flame reduction effects are good. After emission, a calcium chloride solution at the emission port and the tail part of an emission object is atomized to wrap flames, so that flame at the emission port and emission tail flames can be obviously reduced, and flame visible to naked eyes basically does not exist; the training clothes can be kept complete when being launched in a limited space, and cannot be burnt out, broken down or ignited by tail flames or post-spraying objects.

The utility model discloses a gas water heater with a novel silent fire grate burner. A heat exchange assembly comprises a heat exchange chamber and a heat exchange pipeline arranged in the heat exchange chamber. A plurality of heat exchange fins are arranged on the heat exchange pipeline in a penetrating manner; the heat exchange fins and the heat exchange pipelines are made of stainless steel; the combustion chamber assembly comprises a combustion shell and a heat preservation and insulation shell wrapping the outer side of the combustion shell. A heat insulation area is formed between the heat preservation and insulation shell and the combustion shell. A first ventilation structure is arranged on the shell wall of the heat preservation and insulation shell, and a second ventilation structure is arranged on the shell wall of the combustion shell. External air can enter the combustion shell through the first ventilation structure, the heat insulation area and the second ventilation structure. According to the gas water heater, the corrosion resistance can be effectively improved through the heat exchange pipelines and the heat exchange fins which are made of stainless steel, and therefore the service life of the gas water heater is prolonged; a heat insulation area is formed between the heat preservation and insulation shell and the combustion shell, so that combustion noise and outward heat transfer of the combustion chamber can be reduced, and the silence and heat insulation performance of the combustor is improved.

The present disclosure provides a gas turbine combustion noise prediction method, which collects combustion noise related parameters during the operation of the gas turbine as an input feature set, and constructs the energy transfer and balance relationship between each parameter and the combustion noise based on a statistical energy analysis model, so as to replace the solution of complex mathematical equations with a statistical method, thereby effectively predicting the noise level while reducing the problem solving difficulty and complexity; then the calculated reference combustion noise value is input to train and optimize the deep learning network, the neural network automatically learns the classification features and accelerates the noise prediction process, and finally realizes efficient and accurate prediction of the combustion noise. The present disclosure deeply integrates physical prior knowledge and data-driven model, and overcomes the problems of easy damage of physical sensors and poor generalization ability of pure data-driven model. Compared with the prior art, the method significantly reduces the cost of engineering application, and has good prediction accuracy and calculation speed.

The invention provides an engine combustion noise control method. The engine combustion noise control method comprises the steps that S1, operation state parameters of an engine are obtained; s2, the operation working condition of the engine is judged according to the operation state parameters, when the operation working condition is a steady-state working condition, combustion consistency in all piston cylinders of the engine is judged, and combustion correction is conducted on the piston cylinders which are uneven in combustion according to the judgment result; and when the operation working condition is the transient working condition, the current combustion noise change value of the engine is determined according to the mapping relation between the crankshaft rotating speed change rate and the combustion noise change value, and the combustion noise exceeding the set noise range is corrected. The problem that in the prior art, the control effect of an engine combustion noise control mode is poor is effectively solved.

The utility model discloses a furnace end and a burner thereof, the furnace end comprises a furnace end main body which is provided with a central cavity with an upward opening, an inner ring air inlet and an outer ring air inlet, and the lower end of the central cavity is communicated with the inner ring air inlet; the furnace end upper cover is connected to the top of the furnace end main body, the furnace end upper cover is provided with an inner ring gas outlet and a plurality of outer ring gas outlets, the inner ring gas outlet is communicated with the upper end of the central cavity to form an inner ring gas channel, and the plurality of outer ring gas outlets are circumferentially formed in the periphery of the inner ring gas outlet at intervals; the furnace end upper cover and the furnace end body are enclosed to form a closed annular air cavity located on the periphery of the inner ring air channel, the radial inner end of the annular air cavity communicates with the outer ring air inlet, and the radial outer end of the annular air cavity communicates with the outer ring air outlets. According to the furnace end, the uniform pressure of each outer ring air outlet is ensured, the flame of the outer ring reaches a uniform state, and the combustion noise can be reduced.

The application discloses an engine noise control method, device, equipment and storage medium. The control method comprises the following steps: acquiring an actual throttle opening and a gearbox gear in an engine operating state; determining an actual throttle opening change rate according to the actual throttle opening, and determining a vehicle state according to the gearbox gear; when the actual throttle opening change rate is less than a preset throttle opening change rate, outputting a control signal to an engine fuel supply unit according to at least the actual throttle opening change rate and the vehicle state, so as to control the fuel supply state of the engine fuel supply unit and control engine combustion noise. The technical scheme of the application combines the actual throttle opening change rate and the vehicle state to output the control signal to the engine fuel supply unit, changes the engine combustion state, takes into account the vehicle power, controls the engine combustion noise, and improves the driving experience.

To provide a control device that can easily or accurately improve combustion noise of an internal combustion engine.SOLUTION: A control device for an internal combustion engine performs control to reduce combustion noise associated with the combustion of an air-fuel mixture. The control device comprises: a parameter calculation unit 18A for calculating parameters that are determined by the maximum value of an in-cylinder pressure, which is the pressure in a combustion chamber, the maximum value of the rate of increase of the in-cylinder pressure, and the output rotation speed of the internal combustion engine; and a control command unit 18B for controlling at least one of the opening and closing timing of at least one of an intake valve and an exhaust valve, the amount of recirculated exhaust gas, and the ignition timing by a spark plug, so that the parameters become below a threshold value that is predetermined to limit combustion noise.SELECTED DRAWING: Figure 2

The utility model discloses a noise reduction installation structure of a generator set. The noise reduction installation structure comprises a bottom plate, an installation plate and a connecting assembly. A plurality of containing grooves are formed in the top of the bottom plate, and rubber cushion blocks with anti-corrosion coatings are fixed in the grooves. The bottom of the mounting plate is inserted into the positioning holes of the rubber cushion blocks through the positioning columns to form a primary damping layer. Screws penetrate through the four corners of the mounting plate, the bottom ends of the screws extend to the bottom positioning grooves through the bottom plate receding holes and are in threaded connection with threaded holes of the rubber blocks in the grooves, the top ends of the screws press the mounting plate through rubber gaskets, and a damping system for limiting displacement is formed. Clamping grooves are formed in the periphery of the mounting plate and used for fixing the honeycomb-shaped silencing partition plate, and air noise transmission is blocked; and the sealing strips cover gaps between the plates, so that the sound insulation integrity is improved. The bottom of the bottom plate is provided with a drainage groove communicated with the containing groove to ensure rapid drainage of rainwater. Through the rubber cushion block and screw-rubber block two-stage damping design, vibration conduction is efficiently isolated; the honeycomb noise reduction partition board weakens combustion noise in a targeted mode, and the noise reduction reliability is remarkably improved by combining an anti-corrosion and drainage structure.

The fuel injector comprises an adjusting valve, a needle valve assembly and a valve sleeve, the valve sleeve is arranged between the adjusting valve and the needle valve assembly, a first cavity is defined between the adjusting valve and the valve sleeve, and a second cavity is defined between the needle valve assembly and the valve sleeve; the valve sleeve is provided with a first hole, a second hole and a third hole, the first hole is communicated with the first cavity and the second cavity, the second hole is communicated with the peripheral wall of the valve sleeve and the first cavity, and the third hole is communicated with the peripheral wall of the valve sleeve and the second cavity. According to the fuel injector, the problems that in the prior art, combustion efficiency is low, combustion noise is large, fuel economy is poor, the service life is short, and reliability is poor can be solved.

The application discloses an internal combustion engine combustion noise identification technology based on EFD-SST, and belongs to the technical field of internal combustion engines. The internal combustion engine combustion noise identification technology comprises the following steps: step S1: respectively testing the whole machine 5-point noise signals of the internal combustion engine in the rated condition and the motoring condition, wherein the rated condition is 2000r / min, and the motoring condition is 2000r / min; and step S2: separating mechanical noise from combustion noise, and separating the noise by using the motoring method. In the application, the separation of mechanical noise from combustion noise is completed by testing the internal combustion engine noise data and using the motoring method, the combustion noise signal is decomposed by using an empirical Fourier decomposition (EFD) and a synchronous wavelet compression transformation (SST), the internal mechanism of the combustion noise is analyzed, the precision and efficiency of the internal combustion engine combustion noise identification are improved, and more accurate and effective guidance is provided for the control of the internal combustion engine combustion noise.

The application discloses a parking power generation vibration control method and device, electronic equipment and storage medium. According to the application, the control parameters under the running condition are not followed, and a special control parameter set for parking power generation is configured independently of the conventional operation mode, so as to cooperatively optimize and adjust the key parameters related to engine combustion, and improve the sound source characteristics in the parking scene from the source. Therefore, the technical problems of significant crankshaft impact vibration, prominent mechanical noise, rough combustion noise quality and obvious vehicle vibration caused by the fact that the existing parking power generation control strategy follows the running condition parameters and is not adapted to the static acoustic environment can be solved, and the technical effects of improving the vehicle quietness during parking power generation, optimizing the user experience, and reducing related complaints are achieved.

The invention discloses a stable combustion climbing system based on multi-stage vortex and intelligent feedforward and a boiler combustion control method, and the system comprises a multi-stage vortex combustion stabilizer MVS which is configured in a combustor area at the lower part of a hearth and is used for forming a stable high-temperature micro-energy core of pneumatic isolation and guaranteeing the combustion stability under an ultra-low load working condition; the multi-mode combustion sensing system is used for collecting heterogeneous data at least including hearth flame distribution, combustion noise and unit operation parameters in real time, and performing time synchronization fusion on the heterogeneous data and data of a distributed control system (DCS) to obtain fusion data; based on fusion data of a multi-mode combustion sensing system and external load prediction information, a combustion stability index CSI is calculated in real time, a feed-forward control sequence is generated, and a multi-stage vortex combustion stabilizer and a combustor are driven to execute adaptive actions according to the feed-forward control sequence. According to the application, continuous, safe and oil-free stable combustion of the boiler under 10%-15% BMCR load is realized for more than 4 hours; and the peak regulation depth is greatly expanded.

The fuel injector comprises an adjusting valve, an electromagnetic valve, a needle valve assembly and a valve sleeve, the electromagnetic valve is arranged on one axial side of the adjusting valve, the electromagnetic valve comprises a magnetic core and is provided with a spring cavity and an armature cavity, the magnetic core is located between the spring cavity and the armature cavity, and the magnetic core is provided with an inner hole and an open groove; the electromagnetic valve is provided with a first flow path and a second flow path, the first flow path comprises an armature cavity and a slot, the second flow path comprises an inner hole and a spring cavity, and the convergence part of the first flow path and the second flow path is far away from the armature cavity; the valve sleeve is located between the adjusting valve and the needle valve assembly, a transition cavity is defined between the adjusting valve and the valve sleeve, and a control cavity is defined between the needle valve assembly and the valve sleeve. The valve sleeve is provided with a first hole, a second hole and a third hole. The fuel injector can solve the problems that in the prior art, a fuel injector is low in combustion efficiency, large in combustion noise, poor in fuel economy, poor in service life, poor in reliability, poor in control linearity and repeatability of the fuel injection quantity, high in backpressure sensitivity of the armature and the like.

The invention relates to a water heater control method, system and equipment based on an artificial intelligence large model. The water heater control system comprises a water heater intelligent body, an interaction intelligent body and a cloud end, the interaction intelligent body is provided with a trained terminal model, the cloud end is provided with a trained cloud end model, the water heater intelligent body is in communication connection with the interaction intelligent body and the cloud end, and the method comprises the steps that a user instruction and multi-source data are preliminarily processed to obtain a preliminary result; sending the preliminary result to a cloud; analyzing and processing the preliminary result to obtain a control instruction set; the cloud sends the control instruction set to the water heater intelligent body; and the water heater intelligent body controls the water heater based on the control instruction set. According to the method, comprehensive analysis is carried out in combination with various data, accurate prediction is achieved, the problems of constant temperature difference, abnormal combustion noise and poor flue gas emission caused by environment change are avoided, the comfort and economical efficiency of the water heater can be flexibly adjusted according to preferences of different users, and a personalized control strategy is provided.

The invention relates to the technical field of engine combustion noise control, in particular to an engine combustion noise control method and device and a vehicle. The method comprises the steps that the current operation working condition of a parallel type hybrid power system is obtained, and the current operation working condition comprises the charging working condition and the discharging working condition; the engine charges a power battery of the parallel hybrid power system when working under the charging working condition; if the current operation condition is the charging condition, pre-calibrated engine operation parameters are obtained, and the pre-calibrated engine operation parameters comprise the engine operation parameter, with the minimum engine combustion noise, of the engine of the parallel hybrid power system in the calibration test data; engine operation is controlled through the engine operation parameters so as to reduce engine combustion noise. Therefore, the problems that an engine of a parallel hybrid power system in the prior art needs to drive a vehicle and charge a battery at the same time under the charging working condition, and combustion noise is likely to be increased are solved.

The utility model discloses a source noise reduction combustor which comprises a combustor shell, and a combustion cavity is formed in the combustor shell. The combustor shell is provided with a fuel gas channel and an air channel, and the air channel and the fuel gas channel are both communicated with the combustion cavity. The combustion assembly comprises a gas distribution pipe, a gas nozzle and a combustion plate; one end of the gas distributing pipe is used for guiding in gas, the other end of the gas distributing pipe is communicated with the gas nozzle, and the combustion plate is arranged in the combustion cavity and located above the gas nozzle; the combustion plate is provided with a plurality of combustion grooves, each combustion groove is provided with a plurality of first combustion fire holes and a plurality of second combustion fire holes, and the first combustion fire holes and the second combustion fire holes are distributed at intervals in a staggered mode in the second direction; the length of the first combustion fire holes is larger than that of the second combustion fire holes. According to the source noise reduction combustor, the combustion fire hole structures with different lengths can be distributed on the combustion plate at intervals, so that the combustion area of the single combustion plate is increased, and the combustion noise is reduced.

To suppress combustion noise while improving fuel economy.SOLUTION: A control device 100 for an internal-combustion engine includes a spark-ignition internal-combustion engine 1 to which alcohol fuel containing alcohol is supplied, a sensor 3a that detects an alcohol concentration of the alcohol fuel to be supplied to the internal-combustion engine 1, and an ignition timing control unit 12 that controls an ignition timing of the internal-combustion engine 1 to a reference ignition timing that is a later ignition timing of a predetermined optimal ignition timing and a predetermined knock ignition timing. In a case where the alcohol concentration is higher than a predetermined concentration, when the internal combustion engine 1 is operated in a predetermined region, the ignition timing control unit 12 calculates a target delay amount based on the alcohol concentration, and corrects the reference ignition timing to be delayed by the target delay amount.SELECTED DRAWING: Figure 5

Improves fuel efficiency while suppressing combustion noise. [Solution] An internal combustion engine control device 100 includes a spark ignition internal combustion engine 1 supplied with alcohol fuel containing alcohol, a sensor 3a that detects the alcohol concentration of the alcohol fuel supplied to the internal combustion engine 1, and an ignition timing control unit 12 that controls the ignition timing of the internal combustion engine 1 to a reference ignition timing that is the later of a predetermined optimum ignition timing and a predetermined knock ignition timing that prevents knocking. When the alcohol concentration is higher than a predetermined concentration and the internal combustion engine 1 is operating within a predetermined range, the ignition timing control unit 12 calculates a target retard amount based on the alcohol concentration and corrects the reference ignition timing to retard by the target retard amount.

The utility model relates to the technical field of fire grates, in particular to a fire grate, a burner and a gas water heater. The fire row comprises an injection part, a bending part, a rectification part and a head part which are sequentially communicated from bottom to top in the height direction, an air inlet is formed in the injection part, and a fire hole is formed in the top end of the head part. The rectification part comprises a first part and a second part which are arranged side by side in the length direction of the fire grate and communicate with each other, and the first part is located over the bent position of the bent part. In the width direction of the fire grate, the width of the cross section of the airflow channel of the first part is smaller than that of the cross section of the airflow channel of the second part. The burner and the gas water heater comprise the fire grate, and the width of the cross section of the gas flow channel of the first part is smaller than that of the cross section of the gas flow channel of the second part in the width direction of the fire grate, so that mixed gas is evenly distributed at the fire holes, sufficient and stable burning of gas at the fire holes is achieved, distortion and deviation of flames are avoided, and the service life of the burner and the gas water heater is prolonged. The problems that smoke exceeds the standard and combustion noise is high are effectively reduced.

The invention relates to the technical field of vehicles, in particular to an engine combustion noise testing method and device, a vehicle and a medium, and the method comprises the steps: controlling a to-be-tested vehicle to operate based on a preset operation condition under the condition that the current battery electric quantity of the to-be-tested vehicle is greater than a preset electric quantity threshold value; acquiring a first in-vehicle noise sound pressure level of the to-be-tested vehicle; maintaining the to-be-tested vehicle in a preset operation condition, controlling the current battery power consumption to be less than a preset power threshold, enabling the engine of the to-be-tested vehicle to be in a working power generation state, and collecting a second in-vehicle noise sound pressure level of the to-be-tested vehicle; and obtaining an engine combustion noise test result based on the first in-vehicle noise sound pressure level and the second in-vehicle noise sound pressure level. Therefore, the problems that a traditional engine bench test is insufficient in scene adaptability, long in period and the like are solved, and the combustion noise of the engine in the parallel hybrid power system can be effectively separated in the whole vehicle state.

The utility model discloses an upward-drawing type rich-lean fire grate, a burner and a gas water heater. The updraft type dense-thin fire grate comprises a fire grate body, a first injection pipe and a second injection pipe are arranged on the fire grate body, a distribution flow channel and an installation opening are further formed in the fire grate body, the installation opening, the distribution flow channel and the first injection pipe are sequentially communicated, an air outlet part is formed in the tail of the second injection pipe, and a plurality of air outlet holes are formed in the air outlet part; the opening areas of the multiple air outlet holes are in the trend of decreasing in the flowing direction of air flow in the second injection pipe. The side cover plate is arranged on the fire grate main body and covers the air outlet hole, and a dense flame opening is formed between the side cover plate and the fire grate main body; a plurality of light flame ports are formed in the inner core piece; wherein the inner core piece is arranged in the mounting opening. The flame stabilizing effect is optimized, so that the flame combustion stability is improved, and the combustion noise is reduced.

The utility model discloses a gas water heater which comprises a top plate, a wind scooper, a first partition plate and a second partition plate, and the top plate is located at the top of the gas water heater and provided with an air inlet; the wind scooper is connected to the lower portion of the top plate, a wind guiding cavity is formed in the wind scooper, and a wind guiding opening is formed in the side portion of the wind scooper. The first partition plate and the second partition plate are both arranged in the gas water heater and extend in the height direction of the gas water heater. The first partition plate and the second partition plate are arranged in a spaced mode to form an air inlet channel. The top of the air inlet channel is communicated with the air guide opening, and the bottom of the air inlet channel is used for being communicated with a draught fan of the gas water heater. By the adoption of the scheme, the independent air inlet channel can be formed in the gas water heater, an opening does not need to be formed in the shell of the gas water heater, combustion noise is isolated from the outside, and the combustion noise can be reduced.

The downward-blowing type gas water heater comprises a machine shell, a heat exchanger, a combustor and a draught fan, the combustor comprises a shell and a plurality of thick-thin fire rows, a plurality of first air inlets and a plurality of second air inlets are formed in one side of the shell, a ventilation opening is formed in the bottom of the shell, a first injection pipe and a second injection pipe are arranged on one side of each fire row, and the first air inlets are communicated with the second air inlets. A rich flame runner and a lean flame runner are arranged in the fire grate; the light flame flow channel comprises a plurality of first air supply channels and a plurality of second air supply channels, the second air supply channels are distributed on the two sides of the first air supply channels, and the light flame flow channel is configured in the mode that airflow resistance generated by the first air supply channels is larger than airflow resistance generated by the second air supply channels. A plurality of air outlet holes are formed in the second injection pipe, the second injection pipe is communicated with the rich flame flow channel through the air outlet holes, and the opening areas of the air outlet holes are in a larger trend in the flowing direction of air flow in the second injection pipe. The flame stabilizing effect is optimized, so that the flame combustion stability is improved, and the combustion noise is reduced.

The embodiment of the application discloses a power generation equipment, which comprises a shell, a power generation assembly, a controller, an output terminal, a soundproof cover and a first soundproof part. The power generation assembly is arranged in the shell and comprises an engine and a generator. The generator is in transmission connection with the engine. The engine can drive the generator to rotate to generate power. The controller is arranged in the shell and is in electrical connection with the engine and the generator. The controller can control the output voltage or output power of the generator. The output terminal is arranged on the shell and is in electrical connection with the generator. The output terminal is used for connecting external power consumption equipment. The soundproof cover covers the cylinder head of the engine. The first soundproof part is arranged between the soundproof cover and the cylinder head of the engine. The first soundproof part abuts against the inner surface of the soundproof cover and the cylinder head of the engine. The soundproof cover can accurately suppress the most important high-frequency mechanical noise and combustion noise of the engine. The first soundproof part can further improve the soundproof effect and reduce the noise during the operation of the power generation equipment.

The invention relates to the technical field of natural gas energy utilization, and particularly discloses a control method and system for a natural gas magnetization activation energy saver. Performing resonance matching and energy consumption optimization; magnetization application; carrying out on-line effect verification and a catalysis strategy; catalytic activation and mixing optimization; ignition / combustion monitoring and performance evaluation; the invention tends to reduce the generation amount of incomplete combustion products such as CO, unburned hydrocarbon (HC) and the like through more sufficient combustion. By optimizing the air-fuel ratio and the mixing uniformity, the NOx generation path can be controlled while the requirement for the combustion temperature is met, and therefore collaborative emission reduction of pollutants is achieved on the premise that the heat efficiency is guaranteed. Time-frequency feature extraction and on-line combustion characterization jointly enable the system to accurately recognize and inhibit flowing or combusted unstable components (such as periodic pulsation and tempering symptoms). And through real-time fine adjustment of magnetization parameters, catalytic pulses and an air-fuel ratio, flame oscillation and combustion noise can be reduced, and the safety margin of system operation and maintenance is improved.

The invention belongs to the technical field of noise reduction and energy conservation of high-fire stoves, and particularly relates to a noise reduction and energy conservation device of a high-fire stove, which comprises a cover body, and the cover body is formed by vertically connecting a gathering cover for gathering flames and a connecting cover for mounting and fixing; a silencing part is detachably arranged at the bottom of the connecting cover; a kindling gas injection hole and an ignition needle hole are formed in the side wall of the bottom of the connecting cover; and heat insulation protection plates are respectively arranged on the inner side wall of the connecting cover and on the outer sides of the kindling gas injection hole and the ignition needle hole. Through a three-stage noise reduction structure of primary dispersion of the plugging disc, gap segmentation of the ventilation strips and pore turbulence of the noise reduction aggregate, airflow sound energy is consumed step by step, and combustion noise is remarkably reduced.

The utility model discloses a fume hood assembly and water heater, the fume hood assembly includes: the fume collection cover, the smoke guide pipe and the sound insulation smoke pipe, the upper end of smoke guide pipe is the closed end, and the lateral wall is equipped with a plurality of smoke outlet holes, and the lower end of smoke guide pipe is connected in the fume collection cover, and the sound insulation smoke pipe is located at the outer periphery of smoke guide pipe, and is connected in the fume collection cover, the utility model discloses the upper end of smoke guide pipe is the closed end, and the lateral wall is equipped with a plurality of smoke outlet holes, and the lower end is connected in the fume collection cover, and the sound insulation smoke pipe is located at the outer periphery of smoke guide pipe, when the smoke that fume collection cover gathers enters smoke guide pipe, will along with the smoke outlet hole enter the sound insulation smoke pipe and flow out, has changed the characteristic frequency of whole smoke emission system, has broken the inherent frequency condition of heat release pulsation and pressure pulsation mutual excitation through changing system characteristic frequency, makes both difficult to produce effective coupling effect, has suppressed the generation of helmholtz mode oscillation from the root, and further reduced the abnormal combustion noise that the heat sound oscillation has caused.