CN116928670A - Full-premix lower combustion type burner and gas positive displacement water heater - Google Patents

Full-premix lower combustion type burner and gas positive displacement water heater Download PDF

Info

Publication number
CN116928670A
CN116928670A CN202310889073.XA CN202310889073A CN116928670A CN 116928670 A CN116928670 A CN 116928670A CN 202310889073 A CN202310889073 A CN 202310889073A CN 116928670 A CN116928670 A CN 116928670A
Authority
CN
China
Prior art keywords
combustion
gas
burner
cavity
injection cavity
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
CN202310889073.XA
Other languages
Chinese (zh)
Inventor
景洪
饶潘林
何远坤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN202310889073.XA priority Critical patent/CN116928670A/en
Publication of CN116928670A publication Critical patent/CN116928670A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • 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
    • F23D14/70—Baffles or like flow-disturbing devices
    • 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
    • F23D14/84—Flame spreading or otherwise shaping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L5/00—Blast-producing apparatus before the fire
    • F23L5/02—Arrangements of fans or blowers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/007—Regulating fuel supply using mechanical means
    • 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
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/345—Control of fans, e.g. on-off control
    • 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
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/345—Control of fans, e.g. on-off control
    • F24H15/35—Control of the speed of fans
    • 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

Landscapes

  • 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

The application provides a full premix lower combustion type burner and a gas positive displacement water heater, which comprises the following components: a stepless speed regulating fan and an injection cavity; the joint of the stepless speed regulating fan and the injection cavity is provided with a fuel gas servo proportional valve, the outlet of the injection cavity is connected with a combustion cavity, and the injection cavity is provided with a fuel gas servo proportional valveThe chamber is equipped with the guide board with burning chamber junction, is equipped with a plurality of guide hole on the guide board, and the burning chamber is kept away from the one side that draws the chamber and is equipped with the combustor burner, is equipped with a plurality of burner hole on the combustor burner, and the aperture in burner hole is less than the guide hole aperture. The application adopts the automatic control technology of the stepless speed regulation fan and the gas servo proportional valve, firstly, the fan is used for premixing the corresponding needed air and gas according to a certain proportion, then the air and the gas are sent into the injection cavity for secondary mixing, and then the air and the gas are led into the combustion cavity for tertiary mixing through the guide hole, thereby fully and forcefully ensuring the complete premixing of the gas, ensuring the premixed gas to be fully and uniformly combusted on the surface of the burner fire port, having high combustion efficiency and leading NO to be X The (nitrogen oxide) emission is reduced.

Description

Full-premix lower combustion type burner and gas positive displacement water heater
Technical Field
The application relates to the technical field of water heaters, in particular to a full-premix lower combustion type combustor and a gas positive displacement water heater.
Background
The gas water heater is a device which uses gas as energy source and heats water by the heat generated by the combustion of the gas so that the water temperature reaches the requirements of life, heating, production process and the like. The positive displacement gas water heater refers to a water heater which is provided with a container of hot water inside the water heater and is a part of the whole water heater.
The gas-fired positive displacement water heater emits a certain amount of exhaust gas when in operation. Including NO X (Nitrogen oxides) have a certain influence on the air environment, while the traditional gas positive displacement water heater generally adopts an atmospheric burner, and NO in the flue gas X The (nitrogen oxide) content is high.
Conventional NO reduction X The (nitrogen oxide) content is reduced by mixing fuel gases in various proportions and then burning the mixture, and adjusting the mixing proportion of the fuel gases X (Nitrogen oxide) content, but due to insufficient fuel mixing, NO after combustion tends to be X The (nitrogen oxide) content is still not reduced to the desired effect.
Disclosure of Invention
The application aims to solve the problems that the fuel is insufficiently mixed and NO is always burnt X The problem that the (nitrogen oxide) content can not be reduced to the expected effect is solved, on the one hand, a full premix lower combustion type burner is provided, comprising: a stepless speed regulating fan and an injection cavity;
the air outlet of the stepless speed regulating fan is communicated with the inlet of the injection cavity, and the air inlet of the stepless speed regulating fan is communicated with the atmosphere;
the gas servo proportional valve is also connected with an external gas pipeline and is used for adjusting the proportion of various gases input from the external gas pipeline;
the outlet of the injection cavity is connected with a combustion cavity, a guide plate is arranged at the joint of the injection cavity and the combustion cavity, a plurality of guide holes are formed in the guide plate, the guide holes are uniformly distributed on the guide plate, and the injection cavity is communicated with the combustion cavity through the guide holes;
an igniter is arranged in the combustion cavity and is used for igniting the fuel gas;
the burner comprises a burner body, and is characterized in that a burner fire hole is arranged on one side of the burner cavity, which is far away from the injection cavity, a plurality of fire hole holes are formed in the burner fire hole, the fire hole holes are uniformly distributed in the burner fire hole, and the aperture of the fire hole is smaller than that of the guide hole.
In one possible implementation, the length of the injection cavity is greater than or equal to 2-3 times the length of the combustion cavity, and the combustion cavity is arranged at the tail end of the injection cavity.
In one possible implementation, the guide hole has a hole area of 200mm 2 -700mm 2 The hole area of the fire hole is 3mm 2 -10 mm 2 。
In one possible implementation, a guiding metal mesh is arranged on one side of the guiding plate facing the combustion chamber, the guiding plate is connected with the guiding metal mesh in a spot welding mode, and the mesh number of the metal mesh is 20-40 mesh.
In a possible implementation mode, a combustion metal net is arranged on one side, close to the injection cavity, of the burner fire port, the burner fire port is connected with the combustion metal net in a spot welding mode, and the mesh number of the combustion metal net is 20-40 meshes.
In one possible implementation, the cross-sectional shape of the burner fire port is wavy, and the combustion metal mesh is fitted with the shape of the burner fire port.
In one possible implementation manner, the reference for adjusting the fuel gas proportion by the fuel gas servo proportional valve is as follows: the oxygen content in the flue gas after the fuel gas is completely combusted is 5% -7%.
In one possible implementation, an air filter is arranged at the air inlet of the stepless speed regulating fan.
The application also provides a gas positive displacement water heater, which comprises any one of the full-premixing lower-burning type burner and a water tank;
the injection cavity penetrates through the outer wall of the water tank, wherein the combustion cavity and the part, connected with the combustion cavity, of the injection cavity are arranged at the bottom of the inner cavity of the water tank;
the stepless speed regulating fan, the gas servo proportional valve and the part of the injection cavity connected with the gas servo proportional valve are arranged outside the water tank.
In one possible implementation manner, the device further comprises an electronic controller, wherein the electronic controller is arranged on the outer side of the water tank and is in communication connection with the stepless speed regulating fan and used for controlling the start and stop of the stepless speed regulating fan and the wind speed.
From the above, the present application provides a full premix lower combustion burner, comprising: a stepless speed regulating fan and an injection cavity; the gas servo proportional valve is further connected with an external gas pipeline, the outlet of the injection cavity is connected with a combustion cavity, a guide plate is arranged at the joint of the injection cavity and the combustion cavity, a plurality of guide holes are formed in the guide plate, and an igniter is arranged in the combustion cavity and used for igniting the gas; the burner is characterized in that a burner fire port is arranged on one side, away from the injection cavity, of the combustion cavity, a plurality of fire port holes are formed in the burner fire port, and the aperture of each fire port hole is smaller than that of the guide hole. The application adopts the automatic control technology of a stepless speed regulation fan and a gas servo proportional valve, firstly, the fan is used for premixing the corresponding required air and gas according to a certain proportion, and then the air and the gas are sent intoThe injection cavity is used for secondary mixing, and the injection cavity is led into the combustion cavity through the guide hole for tertiary mixing, so that complete premixing of fuel gas is fully and effectively ensured, the premixed fuel gas is fully and uniformly combusted on the surface of a burner fire hole, the combustion efficiency is high, and NO is caused X The (nitrogen oxide) emission is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the practice of the application and together with the description, serve to explain the principles of the embodiments of the application. It is evident that the drawings in the following description are only some embodiments of the implementation of the present application and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic diagram of a fully premixed down-fired burner according to an exemplary embodiment of the present application;
FIG. 2 is a cross-sectional view of FIG. 1;
FIG. 3 is an enlarged view of a portion of FIG. 2;
fig. 4 is a schematic view of a gas-fired positive displacement water heater according to an exemplary embodiment of the present application.
100-stepless speed regulating fan; 200-gas servo proportional valve; 300-injecting cavity; 400-combustion chamber; 500-a water tank;
310-guiding plates; 320-guiding holes; 330-guiding the metal mesh; 410-burner fire port; 420-fire hole; 430-burning the metal mesh.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of the implementations of embodiments of the application.
The gas-fired positive displacement water heater emits a certain amount of exhaust gas when in operation. Including NO X (Nitrogen oxides) have a certain influence on the air environment, while the traditional gas positive displacement water heater generally adopts an atmospheric burner, and NO in the flue gas X The (nitrogen oxide) content is high. Conventional NO reduction X The (nitrogen oxide) content is reduced by mixing fuel gases in various proportions and then burning the mixture, and adjusting the mixing proportion of the fuel gases X (Nitrogen oxide) content, but due to insufficient fuel mixing, NO after combustion tends to be X The (nitrogen oxide) content is still not reduced to the desired effect.
The application aims to solve the problems that the fuel is insufficiently mixed and NO is always burnt X On the one hand, a fully premixed down-burner is provided, referring to fig. 1, fig. 1 is a schematic structural diagram of a fully premixed down-burner according to an exemplary embodiment of the present application; the device comprises a stepless speed regulating fan 100 and an injection cavity 300; the air outlet of the stepless speed regulating fan 100 is communicated with the inlet of the injection cavity 300, and the air inlet of the stepless speed regulating fan 100 is communicated with the atmosphere.
After the stepless speed regulating fan 100 is communicated with the atmosphere, air is blown into the combustor, so that the combustor after the previous combustion can be cleaned, no impurity soot after combustion is ensured in the combustor, and the phenomenon that the combustion of fuel gas after entering the combustor is affected by impurities and insufficient combustion is caused is avoided.
The connection part of the stepless speed regulating fan 100 and the injection cavity 300 is provided with a gas servo proportional valve 200, the gas servo proportional valve 200 is also connected with an external gas pipeline, and the gas servo proportional valve 200 is used for adjusting the proportion of various gases input from the external gas pipeline.
For example, the gas servo proportional valve 200 may be provided with a plurality of valve inlets, which may be connected with a plurality of gases, and the flow rate of the gases may be adjusted by controlling the opening and closing degree of the valve, so as to control the ratio of the gases, so that the mixed gases meet the requirements. The gas is mixed for the first time at this time. After the fuel gas enters the fuel gas servo proportional valve 200, the fuel gas is forced to flow into the injection cavity 300 by the air blast of the stepless speed regulating fan 100, and flows in the injection cavity 300 and is mixed for the second time.
The outlet connection who draws in chamber 300 has burning chamber 400, draws in chamber 300 and burning chamber 400 junction and is equipped with guide board 310, is equipped with a plurality of guide hole 320 on the guide board 310, and guide hole 320 evenly distributed draws in chamber 300 and burning chamber 400 intercommunication through guide hole 320.
The injection cavity 300 is communicated with the combustion cavity 400 through the guide hole 320, and fuel gas also needs to enter the combustion cavity 400 through the guide hole 320. Thus, the gas passes through the guide hole 320 and is mixed for the third time.
A burner is arranged in the combustion chamber 400, and an igniter is used for igniting fuel gas; the side of the combustion chamber 400 away from the injection chamber 300 is provided with a burner fire port 410, the burner fire port 410 is provided with a plurality of fire port holes 420, the fire port holes 420 are uniformly distributed on the burner fire port 410, and the aperture of the fire port holes 420 is smaller than that of the guide hole 320.
The gas after the three-time mixing burns at the fire hole 420, and the aperture of the fire hole 420 is smaller than that of the guide hole 320, so that the combustion is more fully and uniformly, the complete premixing of the gas is ensured by the three-time mixing, the gas is fully and uniformly combusted on the surface of the fire hole 410 of the burner, the combustion efficiency is improved, and meanwhile, the NO is reduced X (nitrogen oxide) emissions.
In some embodiments of the present application, with continued reference to FIG. 1, the length of the injection cavity 300 is greater than or equal to 2 times the length of the combustion cavity 400, and the combustion cavity 400 is disposed at the end of the injection cavity 300.
In the embodiment of the present application, in order to ensure uniform mixing of the fuel gas, sufficient space and distance need to be reserved in the injection cavity 300 so that the fuel gas can be fully mixed when passing through. Thus, before the fuel gas enters the combustion chamber 400 and fills the combustion chamber 400, it should travel a distance of at least one length of the combustion chamber 400 such that the fuel gas entering the combustion chamber 400 is mixed to an equal degree. Since the combustion chamber 400 is at the end of the injection chamber 300 and there is a lengthwise coincidence between the combustion chamber 400 and the injection chamber 300, the length of the injection chamber 300 is at least 2 times the length of the combustion chamber 400. By this distance limitation, the gas is provided with sufficient distance in the injection chamber 300 for adequate mixing.
In some embodiments of the present application, with continued reference to FIG. 1, the guide hole 320 has a hole area of 200mm 2 -700mm 2 The hole area of the burner hole 420 is 3mm 2 -10mm 2 。
Since the fuel gas needs to be introduced into the combustion chamber 400 for combustion, if the area of the guide hole 320 is too small, for example, less than 200mm 2 The rate of gas entering the combustion chamber 400 is affected, resulting in low combustion efficiency and failure to achieve rated power; if the area of the guide hole 320 is too large, for example, more than 700mm 2 The resistance to the gas passing through the guide hole 320 is too small, and the guide hole 320 does not function to further mix the gas, and the hole area of the guide hole 320 is 200mm 2 -700mm 2 When in between, the hole area of the guide hole 320 is 500mm 2 The fuel gas can be further mixed, the combustion efficiency is not affected, and the combustion effect is better.
The burner ports 420 have smaller areas, so that the flames can be tightly distributed on the burner ports 410, and the flames can be burnt in the burner ports 420, so that the flames are uniformly distributed through the areas and the arrangement of the burner ports 420. If the burner ports 420 have too small an area, e.g., less than 3mm 2 The condition of blockage is easy to occur, and the combustion of gas is influenced; if the area of the burner ports 420 is too large, the gas release rate is too high, and there may be insufficient combustion gas. In the embodiment of the application, the fuel gas is released from the smaller holes, for example, the area of the fire hole 420 is 7mm 2 The flow rate of the fuel gas is reduced, and the combustion is more sufficient.
In some embodiments of the present application, referring to fig. 2 and 3, fig. 2 is a cross-sectional view of fig. 1, and fig. 3 is a partial enlarged view of fig. 2; wherein, the guiding plate 310 is provided with a guiding metal net 330 on one side facing the combustion chamber 400, and the mesh number of the metal net 330 is 20-40 mesh.
Guide plate 310 is last to be equipped with guide metal mesh 330, and guide plate 310 and guide metal mesh 330 spot welding are connected, can adjust the gas through guide hole 320 earlier than burner hole 420 for gas distributes evenly, and when the impurity smoke and dust that has the burning to produce simultaneously, guide metal mesh 330 can prevent impurity smoke and dust to fall into injection chamber 300. And the pore diameter of 20-40 meshes is relatively large, so that the gas flow is not seriously influenced.
In some embodiments of the present application, as shown in fig. 2 and 3, a combustion metal mesh 430 is disposed on a side of the burner fire port 420 near the injection cavity 300, the burner fire port 420 is spot welded with the combustion metal mesh 430, and the mesh number of the combustion metal mesh 430 is 20-40 mesh. The combustion metal net 430 also has an effect of uniformly distributing the fuel gas, so that the flame of the burner fire port 410 is uniformly distributed when the fuel gas is combusted, and complete and full combustion is achieved.
In some embodiments of the present application, with continued reference to fig. 2 and 3, the cross-sectional shape of the burner ports 410 is wavy, and the combustion metal mesh 430 conforms to the shape of the burner ports 410.
The cross-sectional shape of the burner fire port 410 is wavy, so that the slag generated and falling from the upper box body after being heated for a long time can be accumulated in the groove without blocking the burner fire port 410, and the burner fire port 410 is convenient to clean.
In some embodiments of the present application, the reference for adjusting the fuel gas ratio by the fuel gas servo proportional valve 200 is: the oxygen content in the flue gas after the fuel gas is completely combusted is 5% -7%. To conform to NO X The (nitrogen oxide) emission content standard and the control of the fuel gas proportion are also needed, wherein the control of the oxygen content in the flue gas after combustion is mainly needed, and in the case of complete combustion of the burner of the application, the oxygen content in the flue gas after combustion can be controlled to be between 5 and 7 percent through the fuel gas servo proportional valve 200, so that the discharged NO X The emission content of (nitrogen oxide) is low, and the national standard requirement can be met.
In some embodiments of the present application, an air filter is provided at the air inlet of the stepless speed regulating fan 100. The stepless speed regulating fan 100 can suck air in and provide power for the fuel gas entering the burner, so that the air and the fuel gas can be mixed together, and the air filter can block foreign matters such as impurity dust in the air and prevent the foreign matters from affecting the combustion of the fuel gas after being mixed with the fuel gas.
When the full-premix lower combustion type combustor is used, firstly, the rated power and the type of the used fuel gas are set according to the fuel gas volumetric water heater, the rotating speed of the stepless speed regulating fan 100 and the fuel gas servo proportional valve 200 are adjusted, the mixing ratio of air and fuel gas is adjusted, and the oxygen content in waste flue gas generated after the fuel gas is fully combusted is ensured to be about 5-7%; at this time, the premixed gas with the mixing ratio regulated is forced to be fed into the injection cavity 300 with a certain length by the stepless speed regulating fan 100 for secondary mixing, and when the premixed gas enters the combustion cavity 400 through the guide holes, a unique metal net flow resistance and pressure equalizing structure is adopted at the guide plate 310, so that the air flow equality of the premixed gas led into the combustion cavity through the guide holes at all positions is ensured. After the premixed fuel gas entering the combustion chamber 400 is mixed for the last time, the premixed fuel gas is sent to the burner fire hole 410 on the wall of the combustion chamber for ignition combustion, and meanwhile, a unique metal net flow-blocking and pressure-equalizing structure is also adopted at the burner fire hole 410, so that the uniform distribution of flame of the burner fire hole 410 during fuel gas combustion is ensured, and complete and full combustion is achieved. The burner ports 410 have a wavy shape, so that the slag generated and dropped from the upper case after heating for a long time can be accumulated in the grooves without clogging the burner ports 410.
As can be seen from the above embodiments, the present application provides a full premix lower combustion burner, comprising: a stepless speed regulating fan and an injection cavity; the connection part of the stepless speed regulating fan and the injection cavity is provided with a gas servo proportional valve, the gas servo proportional valve is also connected with an external gas pipeline, the outlet of the injection cavity is connected with a combustion cavity, the connection part of the injection cavity and the combustion cavity is provided with a guide plate, the guide plate is provided with a plurality of guide holes, and an igniter is arranged in the combustion cavity and used for igniting gas; the side of the combustion chamber, which is far away from the injection chamber, is provided with a burner fire port, a plurality of fire port holes are arranged on the burner fire port, and the aperture of the fire port holes is smaller than the aperture of the guide hole. The application adopts the automatic control technology of a stepless speed regulation fan and a gas servo proportional valve, firstly, the fan is used for premixing the corresponding required air and gas according to a certain proportion, and then the air and the gas are sent into an injection cavity for carrying outSecondary mixing, leading the mixture into a combustion chamber through a guide hole for tertiary mixing, and a unique metal net flow-blocking and pressure-equalizing structure sufficiently and effectively ensures complete premixing of fuel gas, ensures that premixed fuel gas is sufficiently and uniformly combusted on the surface of a burner fire hole, has high combustion efficiency and ensures NO X The (nitrogen oxide) emission is reduced.
In another aspect, the present application provides a gas-fired positive-displacement water heater, referring to fig. 4, fig. 4 is a schematic structural diagram of a gas-fired positive-displacement water heater according to an exemplary embodiment of the present application, where the gas-fired positive-displacement water heater includes any one of the full-premix lower-burner of the above embodiments, and further includes a water tank 500; the injection cavity 300 passes through the outer wall of the water tank 500, wherein the combustion cavity 400 and the part of the injection cavity 300 connected with the combustion cavity 400 are arranged at the bottom of the inner cavity of the water tank 500; the stepless speed regulating fan 100, the gas servo proportional valve 200 and the parts of the injection cavity 300 connected with the gas servo proportional valve 200 are arranged outside the water tank 500.
The combustion chamber 400 is arranged at the bottom of the water tank 500 and can heat the whole water tank, in order to avoid the influence of condensed water generated in the heating process of the gas positive-displacement water heater on the premixed tubular metal fiber burner, the combustion chamber 400 is generally arranged at the top of the water tank of the gas positive-displacement water heater, so that the main combustion chamber is inevitably caused to be positioned in the upper structural mode of the water tank of the water heater, and the water level at the lower part of the water tank of the water heater cannot be completely heated to the required temperature in the heating process. According to the application, the fully premixed lower combustion type burner is arranged at the bottom of the water tank, so that the water in the water tank can be completely heated, and energy is not wasted.
In some embodiments of the present application, the present application further comprises an electronic controller, which is disposed outside the water tank 500 and is communicatively connected to the stepless speed regulating fan 100, for controlling the start and stop of the stepless speed regulating fan and the wind speed. An electronic controller is arranged outside the water tank, so that a user can conveniently operate and use the stepless speed regulating fan manually.
As can be seen from the above embodiments, another aspect of the present application provides a gas volumetric water heater, including a fully premixed bottom-fired burner and a water tank; the injection cavity penetrates through the outer wall of the water tank, wherein the combustion cavity and the part, connected with the combustion cavity, of the injection cavity are arranged at the bottom of the inner cavity of the water tank; the stepless speed regulating fan, the gas servo proportional valve and the connection part of the injection cavity and the gas servo proportional valve are arranged outside the water tank. The combustion chamber is arranged at the bottom of the water tank, so that the whole water tank can be heated, and energy is not wasted. The air speed control device also comprises an electronic controller which is used for controlling the start and stop and the air speed of the stepless speed regulating fan. The electronic controller is arranged outside the water tank, so that a user can conveniently operate and use the stepless speed regulating fan manually.
It should be noted that embodiments of the present application are intended to cover a non-exclusive inclusion, such that a structure, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such structure, article, or apparatus. Without further limitation, the statement "comprises … …" does not exclude that an additional identical element is present in a structure, article or apparatus that comprises the element.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims (10)

1. A full premix lower combustion burner, comprising: a stepless speed regulating fan (100) and an injection cavity (300);
an air outlet of the stepless speed regulating fan (100) is communicated with an inlet of the injection cavity (300), and an air inlet of the stepless speed regulating fan (100) is communicated with the atmosphere;
a gas servo proportional valve (200) is arranged at the joint of the stepless speed regulating fan (100) and the injection cavity (300), the gas servo proportional valve (200) is also connected with an external gas pipeline, and the gas servo proportional valve (200) is used for regulating the proportion of various gases input from the external gas pipeline;
the outlet of the injection cavity (300) is connected with a combustion cavity (400), a guide plate (310) is arranged at the joint of the injection cavity (300) and the combustion cavity (400), a plurality of guide holes (320) are formed in the guide plate (310), the guide holes (320) are uniformly distributed on the guide plate (310), and the injection cavity (300) is communicated with the combustion cavity (400) through the guide holes (320);
an igniter is arranged in the combustion chamber (400) and is used for igniting the fuel gas;
the burner comprises a burner body and is characterized in that a burner fire hole (410) is formed in one side, far away from the injection cavity (300), of the burner body, a plurality of fire hole holes (420) are formed in the burner fire hole (410), the fire hole holes (420) are uniformly distributed in the burner fire hole (410), and the aperture of the fire hole holes (420) is smaller than that of the guide hole (320).
2. The full premix lower burner according to claim 1, wherein the length of the injection cavity (300) is greater than or equal to 2-3 times the length of the combustion cavity (400), and the combustion cavity (400) is arranged at the tail end of the injection cavity (300).
3. The full premix lower burner according to claim 1, wherein the hole area of the guide hole (320) is 200mm 2 -700mm 2 The hole area of the fire hole (420) is 3mm 2 -10mm 2 。
4. The full premix lower combustion burner according to claim 1, wherein a guiding metal mesh (330) is arranged on one side of the guiding plate (310) facing the combustion chamber (400), the guiding plate (310) is in spot welding connection with the guiding metal mesh (330), and the mesh number of the metal mesh (330) is 20-40 mesh.
5. The full premix lower combustion type burner according to claim 1, wherein a combustion metal net (430) is arranged on one side of the burner fire port (420) close to the injection cavity (300), the burner fire port (420) is in spot welding connection with the combustion metal net (430), and the mesh number of the combustion metal net (430) is 20-40 meshes.
6. The full premix lower burner according to claim 5, wherein the cross-sectional shape of the burner fire port (410) is wave-shaped, and the combustion metal mesh (430) is fitted to the shape of the burner fire port (410).
7. The full premix lower combustion burner according to claim 1, wherein the reference for adjusting the fuel gas ratio by the fuel gas servo proportional valve (200) is: the oxygen content in the flue gas after the fuel gas is completely combusted is 5% -7%.
8. The full premix lower combustion burner according to claim 1, wherein an air filter is arranged at the air inlet of the stepless speed regulating fan (100).
9. A gas-fired positive displacement water heater, characterized by comprising a full premix lower burner according to any of claims 1-8, further comprising a water tank (500);
the injection cavity (300) penetrates through the outer wall of the water tank (500), wherein the combustion cavity (400) and the part, connected with the combustion cavity (400), of the injection cavity (300) are arranged at the bottom of the inner cavity of the water tank (500);
the stepless speed regulating fan (100), the gas servo proportional valve (200) and the part, connected with the gas servo proportional valve (200), of the injection cavity (300) are arranged outside the water tank (500).
10. The gas positive-displacement water heater according to claim 9, further comprising an electronic controller, wherein the electronic controller is arranged outside the water tank (500) and is in communication connection with the stepless speed regulating fan (100) for controlling the start and stop and the wind speed of the stepless speed regulating fan (100).
CN202310889073.XA 2023-07-19 2023-07-19 Full-premix lower combustion type burner and gas positive displacement water heater Pending CN116928670A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310889073.XA CN116928670A (en) 2023-07-19 2023-07-19 Full-premix lower combustion type burner and gas positive displacement water heater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310889073.XA CN116928670A (en) 2023-07-19 2023-07-19 Full-premix lower combustion type burner and gas positive displacement water heater

Publications (1)

Publication Number Publication Date
CN116928670A true CN116928670A (en) 2023-10-24

Family

ID=88387344

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310889073.XA Pending CN116928670A (en) 2023-07-19 2023-07-19 Full-premix lower combustion type burner and gas positive displacement water heater

Country Status (1)

Country Link
CN (1) CN116928670A (en)

Similar Documents

Publication Publication Date Title
US9303868B2 (en) Burner system having premixed burners and flame transfer means
US4510890A (en) Infrared water heater
CN205782921U (en) Circulating flue gas reverse-flow type all-premixing burner in a kind of
CA2718589C (en) Gas fuelled radially and axially fed perforated cavity burner
JP5074421B2 (en) System, apparatus and method for flameless combustion without catalyst or high temperature oxidant
US6916175B2 (en) Combustion gas burner enabling multi-stage control
US20140076307A1 (en) Infrared tube heater
CN107420892A (en) A kind of outer circulation smoke backflow formula all-premixing burner
CN214249581U (en) Burner and gas stove, low-nitrogen burner, gas water heater and gas heating water heater using same
KR101456515B1 (en) Reaction furnace using a hot air burning technology
CN201425305Y (en) Saving energy environment protection flat flame burner
US20090145419A1 (en) Furnace heat exchanger
CN213578067U (en) Gas heating water heater
KR101527682B1 (en) Clean Pellet Stove of High Efficiency
CN102092775B (en) Energy-saving zinc oxide kiln
CN116928670A (en) Full-premix lower combustion type burner and gas positive displacement water heater
WO2022096021A1 (en) Burner and applications thereof
CN210979840U (en) Noise-reducing and emission-reducing fire grate
WO2020221366A1 (en) Combustion assembly and wall-mounted stove
CN107477871B (en) Heat exchanger, full-premix hot water boiler and control method thereof
JP3499174B2 (en) Low-pollution, high-efficiency, rich-lean combustion gas burner for households using a porous plate organized by porous metal fiber weaving
CN209013199U (en) Burner for gas stove and gas-cooker comprising it
CN109556111A (en) Boiler
CN211977242U (en) Gas water heating equipment
CN113834066B (en) Combustion device and method for gas water heater

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination