WO2023274381A1 - Ensemble chambre de combustion et dispositif de chauffe-eau au gaz - Google Patents

Ensemble chambre de combustion et dispositif de chauffe-eau au gaz Download PDF

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Publication number
WO2023274381A1
WO2023274381A1 PCT/CN2022/103047 CN2022103047W WO2023274381A1 WO 2023274381 A1 WO2023274381 A1 WO 2023274381A1 CN 2022103047 W CN2022103047 W CN 2022103047W WO 2023274381 A1 WO2023274381 A1 WO 2023274381A1
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WO
WIPO (PCT)
Prior art keywords
gas
air
combustion chamber
combustion
assembly
Prior art date
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PCT/CN2022/103047
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English (en)
Chinese (zh)
Inventor
李鑫
陆祖安
梁泽锋
钱晓林
Original Assignee
芜湖美的厨卫电器制造有限公司
美的集团股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from CN202110754539.6A external-priority patent/CN115560324A/zh
Priority claimed from CN202121507477.0U external-priority patent/CN216619819U/zh
Priority claimed from CN202121505420.7U external-priority patent/CN216619818U/zh
Priority claimed from CN202110754658.1A external-priority patent/CN115560326A/zh
Application filed by 芜湖美的厨卫电器制造有限公司, 美的集团股份有限公司 filed Critical 芜湖美的厨卫电器制造有限公司
Publication of WO2023274381A1 publication Critical patent/WO2023274381A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/60—Devices for simultaneous control of gas and combustion air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/46—Water heaters having plural combustion chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
    • F24H9/1832—Arrangement or mounting of combustion heating means, e.g. grates or burners
    • F24H9/1836—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel

Definitions

  • the present application relates to the technical field of high-temperature air combustion, in particular to a burner assembly and gas-fired hot water equipment.
  • High temperature air combustion (high temperature air combustion) is called “mild and deep hypoxic dilution combustion", referred to as soft combustion, which is a new type of combustion, also known as MILD combustion.
  • soft combustion which is a new type of combustion, also known as MILD combustion.
  • the main characteristics of this combustion are: the chemical reaction mainly occurs in a high-temperature and low-oxygen environment, the temperature of the reactants is higher than its autoignition temperature, and the maximum temperature rise during the combustion process is lower than its autoignition temperature, and the oxygen volume fraction is diluted to the extreme by the combustion products. Low concentration, usually 3% to 10%.
  • the main purpose of this application is to propose a burner assembly and gas-fired water heating equipment, aiming at reducing the emission of pollutants (CO and NOx) and reducing the noise of the gas-fired water heating equipment.
  • a burner assembly which includes:
  • combustion body has a first combustion chamber and a second combustion chamber connected in sequence;
  • a pre-mixer for delivering mixed gas to the first combustion chamber and the second combustion chamber
  • the intake assembly has an air intake, a first air outlet and a second air outlet, the air intake of the intake assembly receives air, the first air outlet of the intake assembly is connected to the pre-mixer
  • the air intake port of the air intake assembly communicates with the second air outlet of the air intake assembly and the first combustion chamber;
  • the intake assembly is used to deliver air to the pre-mixer and the first combustion chamber, and can control the flow rate of air delivered to the first combustion chamber.
  • the air intake assembly includes:
  • a first air flow adjustment device is arranged on the air pipeline, and the first air flow adjustment device is used to adjust the air flow output to the pre-mixer and the first combustion chamber.
  • the first air flow regulating device is an air flow valve, and the air flow valve is arranged in series between the first air outlet and the pre-mixer;
  • the air flow valve is arranged in series between the second air outlet and the first combustion chamber.
  • the premixer includes:
  • Air inlet and gas inlet are Air inlet and gas inlet;
  • a Venturi tube the first air inlet of the Venturi tube communicates with the first air outlet of the first air flow regulating device, and the second air inlet of the Venturi tube communicates with the gas inlet;
  • a mixing chamber the mixing chamber communicates with the Venturi tube and the first combustion chamber and the second combustion chamber.
  • the air intake assembly also includes:
  • a fan the fan is arranged in series between the air inlet and the Venturi tube.
  • the burner assembly also includes:
  • a splitter component is arranged between the pre-mixer and the first combustion chamber, and the splitter component is used to divide the airflow of the pre-mixer into the first combustor and the second combustor respectively. Combustion chamber delivery.
  • the combustion body includes:
  • the air intake casing is covered on one side of the combustion casing, and is enclosed with the combustion casing to form the mixing chamber;
  • the burner assembly also includes:
  • a gas valve the gas valve is arranged between the gas inlet and the Venturi tube.
  • the first combustion chamber is a preheating combustion chamber
  • the second combustion chamber is a high-temperature air combustion chamber.
  • the present application also proposes a gas-fired water heater, including the above-mentioned burner assembly.
  • the gas hot water equipment also includes:
  • the heat exchanger is used to absorb the heat generated by the combustion of the first combustion chamber and the second combustion chamber of the burner assembly and Exchange the absorbed heat with the water inside the heat exchanger.
  • Fig. 1 is the structural representation of an embodiment of the burner assembly of the present application
  • Fig. 2 is a schematic structural view of another embodiment of the burner assembly of the present application.
  • Fig. 3 is a functional module schematic diagram of an embodiment of the burner assembly of the present application.
  • Fig. 4 is a functional module schematic diagram of another embodiment of the burner assembly of the present application.
  • Fig. 5 is a schematic diagram of a partially exploded structure of the burner in Fig. 1;
  • Fig. 6 is a schematic diagram of a partially exploded structure of the frame part in Fig. 1;
  • Fig. 7 is a schematic diagram of the gas flow of an embodiment of the burner assembly of the present application.
  • Fig. 8 is a schematic structural view of another embodiment of the burner assembly of the present application.
  • Fig. 9 is a schematic structural view of another embodiment of the burner assembly of the present application.
  • Fig. 10 is a schematic structural view of another embodiment of the burner assembly of the present application.
  • Fig. 11 is a schematic structural view of another embodiment of the burner assembly of the present application.
  • Fig. 12 is a schematic diagram of functional modules of another embodiment of the new burner assembly of the present application.
  • Fig. 13 is a schematic diagram of functional modules of another embodiment of the new burner assembly of the present application.
  • the burner assembly includes:
  • a combustion body 100 the combustion body 100 has a first combustion chamber 20 and a second combustion chamber 30 connected in sequence;
  • a pre-mixer 200, the pre-mixer 200 is used to deliver mixed gas to the first combustion chamber 20 and the second combustion chamber 30; and,
  • the air intake assembly 300 has an air inlet 31a, a first air outlet 31b and a second air outlet 31c, the air inlet 31a of the air intake assembly 300 receives air, the first air of the air intake assembly 300
  • the outlet 31b communicates with the air inlet 31a of the premixer 200
  • the second air outlet 31c of the air intake assembly 300 communicates with the first combustion chamber 20;
  • the intake assembly 300 is used to deliver air to the pre-mixer 200 and the first combustion chamber 20 , and can control the flow rate of the air delivered to the first combustion chamber 20 .
  • the chemical reaction needs to occur in a high-temperature and low-oxygen environment, the temperature of the reactants is higher than its auto-ignition temperature, and the maximum temperature rise during the combustion process is lower than its auto-ignition temperature, the oxygen volume fraction Diluted to very low concentrations by combustion products.
  • the pyrolysis of fuel is inhibited, the flame thickness becomes thicker, and the flame front disappears, so that the temperature in the entire furnace is very uniform, the combustion peak temperature is low and the noise is extremely small, and Pollutant NOx and CO emissions are greatly reduced.
  • High-temperature preheating air combined with high-speed jets is the main way to achieve high-temperature air combustion; entraining high-temperature flue gas and diluting the combustion air jet is the key to maintaining high-temperature air combustion.
  • the two burners achieve reasonable distribution of gas and achieve the purpose of stable high-temperature air combustion.
  • the combustion main body 100 includes a shell, and the shell is formed with a first combustion chamber 20 and a second combustion chamber 30.
  • the shape of the combustion main body 100 shell can be square, cylindrical, etc., and can be customized according to actual needs. Selection and design are not specifically limited here.
  • the gas hot water equipment also includes a preheating burner installed in the first combustion chamber 20; a heat exchanger located between the smoke outlet and the second combustion chamber 30; the burner assembly also includes an electric control
  • the equipment also includes a water inlet pipe for introducing water into the gas hot water equipment, a hot water outlet pipe for providing hot water to the outside, a smoke exhaust pipe connected to the smoke exhaust port, and a gas inlet pipeline for connecting the gas and intake valve.
  • the preheating burner is used to heat the gas in the MILD combustion chamber.
  • the preheating burner can adopt a honeycomb structure that can effectively prevent flashback during combustion.
  • the gas hot water equipment also includes an igniter, which is used to ignite the gas injected from the preheating burner.
  • the gas water heating equipment also includes an electric control component 500, which is used to control the combustion work of the preheating burner when the gas water heating equipment is started, and the gas and air entering the first combustion chamber 20 are ignited by the preheating burner. Combusting the mixed gas mixed with gas and air heats the air in the first combustion chamber 20 to form high-temperature flue gas. It can be understood that, by controlling the heating temperature, the air in the first combustion chamber 20 can be heated to the target temperature, that is, the above-mentioned preset temperature, so that high-temperature preheating of the air is realized.
  • the first combustion chamber 20 is a preheating combustion chamber
  • the second combustion chamber 30 is a high-temperature air combustion chamber.
  • Another embodiment of this application is to provide unmixed gas through different pipelines, which is applied in the forced-pump gas hot water equipment, by injecting the gas into the air, and then spraying it into the first combustion chamber 20 and the second combustion chamber 30, the strong drum type can be inhaled by the fan 330211, and then sprayed into the combustion chamber respectively.
  • the above-mentioned ways of supplying air and gas to the first combustion chamber 20 and the second combustion chamber 30 are mostly realized through pipelines. Therefore, in specific application embodiments, control valves installed on each pipeline, such as electromagnetic valves, are used to control the flow of pipelines. The gas and air flow rates are used to distribute the gas and air flowing into the first combustion chamber 20 and the second combustion chamber 30 .
  • the gas delivered to the first combustion chamber 20 and the second combustion chamber 30 is an example for illustration.
  • the pre-mixer 200 has a gas inlet and an air inlet.
  • the pre-mixer 200 connects the gas and air
  • the air output from the intake assembly 300 is mixed and then output to the first combustion chamber 20 and the second combustion chamber 30 to complete preheating combustion and high-temperature air combustion.
  • the intake assembly 300 is provided so that during the operation of the burner assembly, the intake assembly 300 divides the incoming air into two parts, so as to deliver air to the pre-mixer 200 and the first combustion chamber 2030 respectively, specifically , the air intake assembly 300 sends a part of air to the pre-mixer 200, so that the pre-mixer 200 mixes the incoming gas and air, and then sends the mixed gas to the first combustion chamber 20 and the second combustion chamber 30, the air intake assembly 300 A further part of the air is then fed to the first combustion chamber 20 .
  • Air is added to the first combustion chamber 20 in two ways through the air intake assembly 300, one of which is directly fed into the air through the air intake assembly 300, and the other is pre-mixed with the gas through the pre-mixer 200 and then passed into the first combustion chamber 20 and the second combustion chamber 30, and then through the first combustion chamber 20, most of the air required for preheating combustion and high-temperature air combustion is preheated.
  • the air in the preheated mixed gas is fully diluted by the mixed gas passed into the second combustion chamber 30, forming a lower oxygen concentration, reducing the combustion reaction speed, and maintaining
  • the higher temperature of the second combustion chamber 30 ensures that the temperature is higher than the self-ignition point of the fuel to realize self-ignition, thereby realizing high-temperature air combustion.
  • the target temperature of the high-temperature preheating air should not be too low, try not to be lower than 600 degrees Celsius, generally controlled at 600 to 1200 degrees Celsius can ensure that when the high-temperature gas contacts the gas in the second combustion chamber 30, a better Automatic combustion, no longer need to ignite to start ignition.
  • the target temperature can be achieved by controlling the heating time, controlling the gas-air ratio, keeping warm, increasing the residence time of the high-temperature gas in the first combustion chamber 20 and other methods.
  • the gas injection speed and gas flow rate delivered by the air intake assembly 300 to the second combustion chamber 30 can be adjusted according to demand, specifically according to the preset temperature, ambient temperature, water inlet flow rate, water outlet temperature, ambient pressure, etc., and the adjusted ratio And the process can be predetermined and set by experiment.
  • the pre-mixer 200 when the gas and air are mixed first, it can be realized by using the pre-mixer 200, and part of the mixed gas flow enters the first combustion chamber 20 for preheating combustion; the other part of the mixed gas is injected into the second combustion chamber.
  • the combustion chamber 30 performs high-temperature air combustion. Since the mixed gas containing gas and air is provided by the pre-mixer 200, the preheating burner ignites and burns the mixed gas and the air delivered by the intake assembly 300, realizing high-temperature preheated air, and delivering gas to the second combustion chamber 30 When mixed with air, more air can be preheated in the first combustion chamber 20, thereby generating an entrainment effect in the second combustion chamber 30, causing high-temperature flue gas to flow back.
  • the first air flow adjustment device 320 is disposed on the air pipeline 310 , and the first air flow adjustment device 320 is used to adjust the air flow output to the pre-mixer 200 and the first combustion chamber 20 .
  • the first air flow regulating device 320 is an air flow valve 321, and the air flow valve 321 is arranged in series between the first air outlet 31b and the pre-mixer Between 200;
  • the air flow valve 321 is arranged in series between the second air outlet 31c and the first combustion chamber 20 .
  • the air flow valve 321 can be located between any one of the two air pipelines 310 .
  • the air flow valve 321 can be arranged in series between the air inlet 31a and the pre-mixer 200, or arranged in series between the air inlet 31a and the first combustion chamber 20, and the air flow valve 321 can be set at different thermal loads. Timely adjust the opening, so as to achieve different excess air coefficients, to achieve the purpose of good preheating effect.
  • the air flow valve 321 may be a solenoid valve with only opening and closing, or an air flow valve 321 that can adjust different opening degrees. A higher excess air ratio in the first combustion chamber 20 can be achieved.
  • the opening of the air flow valve 321 By adjusting the opening of the air flow valve 321, the ratio of the air flow output to the pre-mixer 200 and the first combustion chamber 20 can be adjusted, for example, the air flow valve 321 is arranged between the air inlet 31a and the first combustion chamber 20 When the opening degree of the air flow valve 321 is increased, the proportion of air output to the first combustion chamber 20 increases, and the proportion of air output to the pre-mixer 200 decreases. Conversely, if the opening of the air flow valve 321 decreases, the proportion of air output to the first combustion chamber 20 decreases, and the proportion of air output to the pre-mixer 200 increases.
  • the air ratio between the pre-mixer 200 and the first combustion chamber 20 can also be adjusted. In this way, it can be ensured that the air flow output to the first combustion chamber 20 and the second combustion chamber 30 can meet the preheating combustion in the first combustion chamber 20, and in the case of the high-temperature air combustion in the second combustion chamber 30, the improvement The excess air ratio of the first combustion chamber 20 .
  • the pre-mixer 200 includes:
  • Air inlet and gas inlet are Air inlet and gas inlet;
  • Venturi tube 210 the first air inlet of the Venturi tube 210 communicates with the first air outlet 31b of the first air flow regulating device 320, the second air inlet of the Venturi tube 210 communicates with the Gas inlet connection;
  • the mixing chamber 10 communicates with the venturi tube 210 and the first combustion chamber 20 and the second combustion chamber 30 .
  • the burner assembly can also be provided with a gas pipeline, the venturi tube 210 is located between the air pipeline 310 and the gas pipeline, and between the mixing chamber 10, the venturi tube 210 and the air pipeline 310 and the gas inlet pipe Together they form a pre-mixer 200 communicating with the mixing chamber 10 .
  • Air can enter the venturi tube 210 from the air inlet of the air pipeline 310 and form an air vortex at the outlet of the venturi tube 210 .
  • the air vortex can entrain the gas entering from the gas inlet pipe, so that the gas and air are fully mixed in the Venturi tube 210, so that the fully mixed gas and air mixture can be fully combusted in the gas hot water equipment, thereby It can improve combustion efficiency and reduce the generation of harmful substances such as nitrogen oxides (NOx) and carbon monoxide.
  • the Venturi tube 210 communicates with the intake port and the mixing chamber 10 to output the mixed gas to the first combustion chamber 20 and the second combustion chamber 30 .
  • the fan 330 is arranged in series between the air inlet and the Venturi tube 210 .
  • the gas and air can first enter the Venturi structure, and then the mixed gas enters the fan 330 for mixing. Therefore, the fan 330 needs to use an explosion-proof fan 330, so that the air and gas have a better mixing effect.
  • the fan 330 can also be placed before the Venturi device. At this time, the fan 330 can use a common fan 330 to draw air into the Venturi tube 210 through the fan 330 to complete the mixing of air and gas in the Venturi tube 210.
  • the blower 330 adjusts its rotational speed to provide the burner unit with a corresponding flow rate of air or mixed gas under different working conditions, such as different heat load demands, to complete high-temperature air combustion.
  • a second flow path for the gas in the intake cavity 10 to flow into the second combustion chamber 30 is formed between the side of the baffle plate 411 and the wall of the intake cavity 10 .
  • a side of the baffle plate 411 facing the air intake cavity 10 is surrounded by a plurality of side plates 412 .
  • the spoiler 420 is disposed between the flow splitter 410 and the first combustion chamber 20 to disturb the gas flowing into the first combustion chamber 20 .
  • the spoiler 420 is a porous spoiler, and the porous spoiler is provided with a plurality of spoiler flow holes, and the apertures of the plurality of spoiler flow holes are smaller than the apertures of the air holes 411a of the flow divider 410 .
  • the air hole 411a and the turbulence flow hole of the flow divider 410 can be set as a circular through hole, or a square through hole, or a strip-shaped through hole, and the air hole 411a and the turbulence flow hole of the flow divider 410 can be set to be the same or different. .
  • the preheating burner is installed in the first combustion chamber 20 formed by the main body, the preheating burner is used to ignite the mixed gas and transport it to the first combustion chamber 20 of the burner 100, and preheat the first combustion chamber 20 Heat to target temperature.
  • the preheating burner includes: a porous media burner 430 disposed between the spoiler 300 and the first combustion chamber 20 .
  • the porous medium 430 combustion method is adopted, and the porous medium burner 430 is set in the first combustion chamber 20
  • the combustion body 100 includes:
  • the combustion casing 110 is provided with a first air inlet connecting the mixing chamber 10 and the first combustion chamber 20 and a second air inlet connecting the mixing chamber 10 and the second combustion chamber 30 .
  • the frame portion 111 has opposite first and second sides, and the first combustion chamber 20 and the second combustion chamber 30 are arranged in sequence from the first side to the second side, and the frame portion 111
  • the first side of the frame body part 111 is a frame opening, and at least one side frame of the frame body part 111 is provided with a gas connection piece 1114;
  • the fixing plate 112 the fixing plate 112 is covered on the first side of the frame part 111, and the air intake housing 120 is covered on the side of the fixing plate 112 facing away from the frame part 111;
  • the first air inlet 121a is arranged at the position of the fixed plate 112 corresponding to the first combustion chamber 20
  • the second air inlet 121b is arranged at the position of the fixed plate 112 corresponding to the gas connector 1114 position, the gas connecting piece 1114 communicates with the intake chamber 10 and the second combustion chamber 30 .
  • the first side of the frame part 111 is fixedly connected to the air intake housing 120
  • the fixing plate 112 is interposed between the frame part 111 and the air intake housing 120
  • the frame part 111 can be provided with Screw holes
  • corresponding positions on the air intake housing 120 and the fixed plate 112 are provided with through holes
  • the screws pass through the through holes on the air intake housing 120 and the fixed plate 112, and are installed in the screw holes of the frame part 111, so that
  • the intake casing 120 , the fixing plate 112 and the frame part 111 are fixed by screws.
  • the fixed plate 112 covers the frame opening, and at least two air inlets are provided on the fixed plate 112, that is, the first air inlet 121a and the second air inlet 121b.
  • the heat absorption pipe 500 can be arranged to form a water passage, and the water passage can also be designed inside the combustion body 100 .
  • the water passages may all be formed by the channels in the heat absorbing pipe 500 , or all be formed by the channels in the combustion body 100 . It is also possible to make the water channel partly formed by the channel in the heat absorption pipe 500 , and partly formed by the channel in the combustion body 100 .
  • the flow path of the water passage can only extend along a part of the wall of the combustion body 100 , or can be arranged around the wall of the combustion body 100 , or can be arranged in a spiral shape and multi-layered around the wall of the combustion body 100 .
  • the flow path of the water passage is not specifically limited here, and can be selected and designed according to actual needs.
  • the first water cavity 111a is formed in the first end cover 1111
  • the second water cavity 111b is formed in the second end cover 1112
  • a heat-absorbing pipe 500 is connected in series to form a water passage, so that the water capacity can be fully utilized.
  • the heat absorption pipe 500 may be specifically arranged as a straight pipe, extending along the length direction of the combustion body 100 .
  • the space in the end cover is fully utilized without affecting the use effect of the end cover, so that the water channel
  • the flow through the inside of the first end cover 1111 and the second end cover 1112 makes the overall cooling area larger.
  • the heat absorbing pipe 500 is located in the combustion chamber 11, and the heat exchange rate between the heat absorbing pipe 500 and the airflow in the combustion chamber 11 can be improved, and the temperature in the combustion chamber 11 can be sufficiently reduced to prevent heat from radiating to the outside of the burner assembly 100. Reduce the generation of pollutants.
  • the material of the heat-absorbing pipe 500 should be a material with high temperature resistance and good thermal conductivity.
  • first end cover 1111 is surrounded by the first sub-end cover 1111a and the first sub-end cover 1111b, and the first sub-end cover 1111a and the second sub-end cover 1111b form the first water cavity 111a.
  • first end cover 1112 is surrounded by the second sub-end cover 1112a and the second sub-end cover 1112b, and the second sub-end cover 1112a and the second sub-end cover 1112b form the first water cavity 111b.
  • the number of the peripheral side plates 1113 is two, and the two peripheral side plates 1113 are arranged opposite to each other;
  • the two peripheral side plates 1113 are respectively provided with connection pieces 1114 communicating with the gas.
  • MILD inlet chambers 10 are provided on the two peripheral side plates 1113, that is, the gas connection piece 1114, and the gas connection piece 1114 and the combustion body 100 can be integrally formed or separately formed.
  • the gas connecting piece 1114 and the combustion body 100 can be fixedly connected by means of screws, welding or the like.
  • the connection channel in the gas connection part 1114 the gas output from the intake chamber 10 can flow into the second combustion chamber 30 from the second flow path formed by the splitter assembly 400 and the wall of the intake chamber 10 .
  • the gas connection 1114 extends along the length of the combustion body 100 .
  • the gas connection piece 1114 has a pipe body with an opening (air inlet 1114a) on the side facing the inlet chamber 10, and the inlet 1114a facing the inlet chamber 10 is used to access the gas output by the inlet chamber 10, There is at least one gas outlet on the other side of the pipe body, and the gas outlet communicates with the second combustion chamber 30 .
  • Two gas connectors 1114 are provided on both sides of the combustion body, so as to deliver gas to the second combustion chamber 30 from both sides, so that the gas flowing into the second combustion chamber 30 can be more uniform.
  • the number of the gas connecting piece 1114 can also be set to one, which is not limited here.
  • a plurality of gas holes 1114 b are provided at one end of the gas connecting member 1114 near the second combustion chamber 30 for gas to flow into the second combustion chamber 30 .
  • the gas is sprayed into the second combustion chamber 30, and the injection flow rate of the multiple gas holes 1114b is more uniform, and it can ensure that each The gas flow rate injected by each gas hole 1114b, and then realize the combustion of the whole second combustion chamber 30 is more stable, so as to realize entrainment and dilution of high-temperature flue gas, so that the gas and air in the second combustion chamber 30 can be mixed evenly, so that the second combustion chamber 30
  • the oxygen concentration in the second combustion chamber will also be balanced and lower than a certain value.
  • the combustion body can be The opposite sides of 100 inject gas and/or air into the second combustion chamber 30.
  • the gas injection volume is increased, and on the other hand, the mixed gas of gas and air is evenly distributed in the combustion chamber, and is fully combined with high-temperature air. to burn.
  • a gap is formed between the flow divider 410 and the inner side wall of the intake housing 120, and the gap is for the gas of the intake chamber 10 to flow into The flow paths of the first combustion chamber 20 and the second combustion chamber 30 .
  • a gap ⁇ is formed between the splitter 410 and the fixing plate 112 , and the gap is a flow path for the gas in the intake chamber 10 to flow into the first combustion chamber 20 .
  • the baffle plate 411 may not be provided with air holes 411a. If there is no hole on the baffle plate, after the gas flows in from the inlet of the air intake chamber 10, it will be directly disturbed by the baffle plate 411 to the peripheral side of the baffle plate 411. . It can be adjusted by adjusting the size of the baffle plate 411, the number and distribution of holes on the flow divider 410, the distance ⁇ between the baffle plate and the intake housing 120, the distance ⁇ between the baffle plate and the fixed plate 112, and the size of the MILD air intake chamber 10. The opening size ⁇ is used to adjust the gas flow distribution to the first combustion chamber 20 and the second combustion chamber 30, so as to achieve the MILD combustion state. The distance between the flow divider 410 and the inner sidewall of the intake housing 120 is adjustable. The distance between the splitter 410 and the fixing plate 112 is adjustable.
  • the baffle 411 can be driven to move by a driving member, thereby adjusting the relative distance between the baffle 411 and the fixed plate 112 , and adjusting the relative distance ⁇ between the baffle 411 and the intake housing 120 , Then adjust the size of the gap to realize the distribution of gas flow.
  • the burner assembly further includes:
  • a gas valve 220 the gas valve 220 is disposed between the gas inlet and the Venturi tube 210 .
  • the gas valve 220 may be a solenoid valve with only opening and closing, or a gas proportional valve that adjusts different opening degrees.
  • the gas valve 220 is arranged between the gas inlet port and the pre-mixer 200.
  • the opening of the gas valve 220 is adjustable. By adjusting the opening of the gas valve 220, the gas delivered to the first combustion chamber 20 and the second combustion chamber can be adjusted.
  • the gas flow rate in the chamber 30 increases, for example, when the opening of the gas valve 220 increases, the gas output to the pre-mixer 200 and the second combustion chamber 30 increases.
  • the number of gas channels formed between the second air outlet 31c of the first air flow regulating device 320 and the first combustion chamber 20 is multiple.
  • the gas pipeline is connected between the first air flow regulating device 320 and the first combustion chamber 20, and the number of gas pipelines between the first air flow regulating device 320 and the first combustion chamber 20 can be two or Multiple strips, for example, are arranged on opposite sides of the gas casing, so that the air output to the first combustion chamber 20 is more uniform, which is beneficial to improve the combustion effect of high-temperature air combustion.
  • the electric control assembly 500 includes an electric control board and a burner assembly control circuit arranged on the electric control board.
  • the burner assembly control circuit can be a main controller, a gas valve drive circuit, a fan drive Proportional valve drive circuit, etc., wherein, the gas valve drive circuit, fan drive circuit, gas proportional valve drive circuit can be realized by using a drive circuit composed of a relay, MOS tube, IGBT and other power tubes.
  • the main controller can receive control instructions input by users through wireless communication circuits, such as Bluetooth modules, infrared induction circuits, WIFI modules, etc., and control the burner components to work according to the corresponding control instructions to meet the user's water demand.
  • a combustion body 100 the combustion body 100 has a first combustion chamber 20 and a second combustion chamber 30 connected in sequence;
  • the pre-mixer 200 communicates with the first combustion chamber 20 and the second combustion chamber 30 in turn, and the pre-mixer 200 is used to deliver mixed gas to the first combustion chamber 20 and the second combustion chamber 30; and,
  • the air intake assembly 300 has a gas inlet 31a, a first gas outlet 31b and a second gas outlet 31c, the gas inlet 31a of the air intake assembly 300 is connected to gas, and the first gas
  • the outlet 31b communicates with the gas inlet 31a of the premixer 200
  • the second gas outlet 31c of the air intake assembly 300 communicates with the second combustion chamber 30;
  • the chemical reaction needs to occur in a high-temperature and low-oxygen environment, the temperature of the reactants is higher than its auto-ignition temperature, and the maximum temperature rise during the combustion process is lower than its auto-ignition temperature, the oxygen volume fraction Diluted to very low concentrations by combustion products.
  • the pyrolysis of fuel is inhibited, the flame thickness becomes thicker, and the flame front disappears, so that the temperature in the entire furnace is very uniform, the combustion peak temperature is low and the noise is extremely small, and Pollutant NOx and CO emissions are greatly reduced.
  • High-temperature preheating air combined with high-speed jets is the main way to achieve high-temperature air combustion; entraining high-temperature flue gas and diluting the combustion air jet is the key to maintaining high-temperature air combustion.
  • the two burners achieve reasonable distribution of gas and achieve the purpose of stable high-temperature air combustion.
  • the combustion main body 100 includes a shell, and the shell is formed with a first combustion chamber 20 and a second combustion chamber 30.
  • the shape of the combustion main body 100 shell can be square, cylindrical, etc., and can be customized according to actual needs. Selection and design are not specifically limited here.
  • the shell is also provided with a smoke exhaust port. When the gas burns at high temperature in the second combustion chamber 30, the heat after combustion is discharged through the smoke exhaust port, and can exchange heat with the heat exchanger of the gas water heater to realize the production Get hot water.
  • the gas water heater also includes a preheating burner installed in the first combustion chamber 20; a heat exchanger located between the smoke outlet and the second combustion chamber 30; the burner assembly also includes an electric control assembly 500, and the gas water heater also includes The water inlet pipe for introducing water into the gas water heater, the hot water outlet pipe for providing hot water to the outside, the smoke exhaust pipe connected to the smoke exhaust port, the gas inlet pipeline and the inlet valve for connecting the gas.
  • the preheating burner is used to heat the gas in the MILD combustion chamber.
  • the preheating burner can adopt a honeycomb structure that can effectively prevent flashback during combustion.
  • the gas water heater also includes an igniter, which is used to ignite the gas injected from the preheating burner.
  • the gas delivered to the first combustion chamber 20 and the second combustion chamber 30 is an example for illustration.
  • the pre-mixer 200 has a gas inlet and an air inlet.
  • the pre-mixer 200 connects the gas and air
  • the air output from the intake assembly 300 is mixed and then output to the first combustion chamber 20 and the second combustion chamber 30 to complete preheating combustion and high-temperature air combustion.
  • the target temperature of the high-temperature preheating air should not be too low. Generally, it can be controlled at 1200 degrees Celsius to ensure that when the high-temperature gas contacts the gas in the second combustion chamber 30, better automatic combustion can be achieved, and ignition is no longer required. burn.
  • the target temperature can be achieved by controlling the heating time, controlling the gas-air ratio, keeping warm, increasing the residence time of the high-temperature gas in the first combustion chamber 20 and other methods.
  • the gas injection speed and gas flow rate delivered by the air intake assembly 300 to the second combustion chamber 30 can be adjusted according to demand, specifically according to the preset temperature, ambient temperature, water inlet flow rate, water outlet temperature, ambient pressure, etc., and the adjusted ratio And the process can be predetermined and set.
  • the preheating burner ignites and burns the mixed gas to realize high-temperature preheated air, and the mixed gas of gas and air is delivered to the second combustion chamber 30, and then passed
  • the air intake assembly 300 sends gas to the second combustion chamber 30, so that more air can be preheated in the first combustion chamber 20, thereby generating an entrainment effect in the second combustion chamber 30, so that the high-temperature flue gas flows back,
  • heat preservation can make the temperature higher than the spontaneous ignition point of the fuel, so that the gas in the combustion chamber can spontaneously ignite;
  • Air combustion can meet MILD combustion requirements and reduce CO and NOx emissions.
  • the combustion chamber 30 provides gas, while the air flowing to the first combustion chamber 20 and the second combustion chamber 30 is all provided through the pre-mixer 200, so that more air can be preheated by the preheating burner in the first combustion chamber 20 That is, the excess air ratio of the first combustion chamber 20 is higher than that of the second combustion chamber 30, so that more air participates in the combustion of the first combustion chamber 20 and is directly heated, which can improve the preheating effect.
  • the technical solution of this embodiment is conducive to simultaneously achieving the above two conditions required for realizing MILD combustion, and successfully realizing high-temperature air combustion.
  • the air intake assembly 300 is used to complete high-temperature air combustion. After the mixed gas is properly distributed to the two-stage combustion chamber, the air intake assembly 300 can also output another gas to the second combustion chamber 30, which can be used under a certain air-fuel ratio. In this way, more air is preheated in the first combustion chamber 20, thereby increasing the excess air ratio of the first combustion chamber 20, that is, more air participates in the combustion of the first combustion chamber 20 and is directly heated. It is conducive to improving the preheating effect, making it easier for the water heater to enter the high-temperature air combustion state, and is conducive to achieving lower NOx and CO emissions.
  • the air intake assembly 300 includes:
  • a gas pipeline 310 communicating with the gas inlet 31a, the first gas outlet 31b and the second gas outlet 31c;
  • the first gas flow regulating device 320 is arranged on the gas pipeline 310 , and the first gas flow regulating device 320 is used for regulating the gas flow output to the pre-mixer 200 and the second combustion chamber 30 .
  • the first gas flow regulating device 320 can control the on/off of the gas output to the pre-mixer 200 and the second combustion chamber 30 , and can also adjust the gas output to the pre-mixer 200 and the second combustion chamber 30
  • the gas flow rate can also be adjusted to the proportion of the gas output to the pre-mixer 200 and the second combustion chamber 30, which can be set according to actual needs, and there is no limitation here.
  • the excess air ratio of the first combustion chamber 20 can be adjusted through the first gas flow regulating device 320, so that the air and gas can be preheated better and the air and gas can enter high temperature better without changing the air-fuel ratio. air burning state.
  • the first gas flow regulating device 320 includes:
  • gas proportional valve 322 the gas proportional valve 322 is arranged in series between the gas valve 321 and the pre-mixer 200;
  • the gas valve 321 and the gas proportional valve 322 are respectively located in the trunk road and the branch road 2 of the gas. Specifically, the gas proportional valve 322 is arranged in series between the gas valve 321 and the premixer 200, or is arranged in series between the gas valve 321 and the second combustion chamber 30.
  • the gas proportional valve 322 can adjust the opening degree under different heat loads, In order to achieve different excess air coefficients, to achieve the best results.
  • the gas valve 321 may be a solenoid valve with only opening and closing, or a gas proportional valve 322 that can adjust different opening degrees.
  • the gas flow ratio output to the pre-mixer 200 and the second combustion chamber 30 can be adjusted.
  • the gas proportional valve 322 is arranged between the gas valve 321 and the second combustion chamber 30, As the opening of the gas proportional valve 322 increases, the proportion of gas output to the second combustion chamber 30 increases, and the proportion of gas output to the pre-mixer 200 decreases. Conversely, if the opening of the gas proportional valve 322 decreases, the proportion of gas output to the second combustion chamber 30 decreases, and the proportion of gas output to the pre-mixer 200 increases.
  • the gas proportional valve 322 when the gas proportional valve 322 is arranged between the gas valve 321 and the pre-mixer 200 , the gas ratio between the pre-mixer 200 and the second combustion chamber 30 can also be adjusted. In this way, it can be ensured that the air flow output to the first combustion chamber 20 and the second combustion chamber 30 can meet the preheating combustion in the first combustion chamber 20, and in the case of the high-temperature air combustion in the second combustion chamber 30, the improvement The excess air ratio of the first combustion chamber 20 .
  • the number of gas channels formed between the second gas outlet 31c of the first gas flow regulating device 320 and the second combustion chamber 30 is multiple.
  • the gas pipeline is connected between the first gas flow regulating device 320 and the second combustion chamber 30, and the number of gas pipelines between the first gas flow regulating device 320 and the second combustion chamber 30 can be two or many lines.
  • the two gas pipelines between the first gas flow regulating device 320 and the second combustion chamber 30 are marked as 311 and 312 respectively, and the gas pipelines 311 and 312 are arranged on opposite sides of the gas casing 110, so that the output The gas delivered to the second combustion chamber 30 is more uniform, which is conducive to improving the combustion effect of high-temperature air combustion.
  • the present application also provides a gas hot water device.
  • the gas water heating equipment includes the above-mentioned burner assembly, and the heat exchanger produces hot water through the heat generated by the burner assembly.
  • the detailed structure of the burner assembly can refer to the above-mentioned embodiment, and will not be repeated here;
  • the examples include all the technical solutions of all the embodiments of the above-mentioned burner assembly, and the achieved technical effects are also exactly the same, so they will not be repeated here.
  • the gas hot water equipment further includes:
  • a heat exchanger (not shown in the figure), one end of the heat exchanger communicates with the cold water inlet pipe, and the other end communicates with the hot water outlet pipe, and the heat exchanger is used to absorb the combustion of the first combustion chamber 20 of the burner assembly and the second
  • the combustion chamber 30 burns generated heat and exchanges the absorbed heat with water inside the heat exchanger.
  • the cold water inlet pipe is used to introduce cold water from the outside to the gas hot water equipment, and send the cold water to the heat exchanger, and the heat exchanger absorbs the heat generated by the preheating burner and MILD combustion to heat the cold water into hot water. Water and hot water are led to the gas hot water equipment through the hot water outlet pipe.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)

Abstract

Ensemble chambre de combustion et dispositif de chauffe-eau au gaz. L'ensemble chambre de combustion comprend : un corps de combustion (100) présentant une première chambre de combustion (20) et une seconde chambre de combustion (30) qui sont en communication séquentielle ; un pré-mélangeur (200) destiné à transférer un gaz mélangé dans la première chambre de combustion (20) et la seconde chambre de combustion (30) ; et un ensemble d'entrée d'air (300) présentant une entrée d'air (31a), une première sortie d'air (31b) et une seconde sortie d'air (31c), l'entrée d'air (31a) de l'ensemble d'entrée d'air (300) étant reliée à l'air, la première sortie d'air (31b) de l'ensemble d'entrée d'air (300) étant en communication avec une entrée d'air du pré-mélangeur (200) et la seconde sortie d'air (31c) de l'ensemble d'entrée d'air (300) étant en communication avec la première chambre de combustion (20), l'ensemble d'entrée d'air (300) étant configuré pour transférer de l'air vers le pré-mélangeur (200) et la première chambre de combustion (20), et pouvant commander la quantité d'un flux d'air transféré à la première chambre de combustion (20).
PCT/CN2022/103047 2021-06-30 2022-06-30 Ensemble chambre de combustion et dispositif de chauffe-eau au gaz WO2023274381A1 (fr)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
CN202110754539.6A CN115560324A (zh) 2021-06-30 2021-06-30 燃烧器组件及燃气热水器
CN202121507477.0U CN216619819U (zh) 2021-06-30 2021-06-30 燃烧器组件及燃气热水设备
CN202121507477.0 2021-06-30
CN202121505420.7U CN216619818U (zh) 2021-06-30 2021-06-30 燃烧器组件及燃气热水器
CN202110754539.6 2021-06-30
CN202110754658.1 2021-06-30
CN202110754658.1A CN115560326A (zh) 2021-06-30 2021-06-30 燃烧器组件及燃气热水设备
CN202121505420.7 2021-06-30

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4752213A (en) * 1985-11-06 1988-06-21 Gaz De France Forced-air gas burner
JP2007225267A (ja) * 2006-02-27 2007-09-06 Noritz Corp 燃焼装置
CN111947296A (zh) * 2020-07-21 2020-11-17 华帝股份有限公司 一种全预混燃气热水器和控制方法
CN212618284U (zh) * 2019-10-17 2021-02-26 芜湖美的厨卫电器制造有限公司 燃烧器及燃气热水器
CN216619818U (zh) * 2021-06-30 2022-05-27 芜湖美的厨卫电器制造有限公司 燃烧器组件及燃气热水器
CN216619819U (zh) * 2021-06-30 2022-05-27 芜湖美的厨卫电器制造有限公司 燃烧器组件及燃气热水设备

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4752213A (en) * 1985-11-06 1988-06-21 Gaz De France Forced-air gas burner
JP2007225267A (ja) * 2006-02-27 2007-09-06 Noritz Corp 燃焼装置
CN212618284U (zh) * 2019-10-17 2021-02-26 芜湖美的厨卫电器制造有限公司 燃烧器及燃气热水器
CN112682788A (zh) * 2019-10-17 2021-04-20 芜湖美的厨卫电器制造有限公司 燃烧器及燃气热水器
CN112682785A (zh) * 2019-10-17 2021-04-20 芜湖美的厨卫电器制造有限公司 燃烧器和燃气热水器
CN112682781A (zh) * 2019-10-17 2021-04-20 芜湖美的厨卫电器制造有限公司 燃烧器及燃气热水器
CN111947296A (zh) * 2020-07-21 2020-11-17 华帝股份有限公司 一种全预混燃气热水器和控制方法
CN216619818U (zh) * 2021-06-30 2022-05-27 芜湖美的厨卫电器制造有限公司 燃烧器组件及燃气热水器
CN216619819U (zh) * 2021-06-30 2022-05-27 芜湖美的厨卫电器制造有限公司 燃烧器组件及燃气热水设备

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