CN111795497A - Porous medium burning hot water boiler - Google Patents
Porous medium burning hot water boiler Download PDFInfo
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- CN111795497A CN111795497A CN202010689508.2A CN202010689508A CN111795497A CN 111795497 A CN111795497 A CN 111795497A CN 202010689508 A CN202010689508 A CN 202010689508A CN 111795497 A CN111795497 A CN 111795497A
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- hot water
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 276
- 238000002485 combustion reaction Methods 0.000 claims abstract description 239
- 239000000779 smoke Substances 0.000 claims abstract description 34
- 239000003546 flue gas Substances 0.000 claims description 63
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 62
- 239000007789 gas Substances 0.000 claims description 43
- 238000011144 upstream manufacturing Methods 0.000 claims description 25
- 238000009413 insulation Methods 0.000 claims description 8
- 230000009970 fire resistant effect Effects 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 11
- 238000004134 energy conservation Methods 0.000 abstract description 5
- 230000009467 reduction Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 12
- 239000000567 combustion gas Substances 0.000 description 7
- 239000000919 ceramic Substances 0.000 description 6
- 239000002737 fuel gas Substances 0.000 description 6
- 239000002918 waste heat Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 5
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 5
- 229910010271 silicon carbide Inorganic materials 0.000 description 5
- 238000009833 condensation Methods 0.000 description 4
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- 238000005516 engineering process Methods 0.000 description 4
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 3
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- 229910052757 nitrogen Inorganic materials 0.000 description 3
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- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000008236 heating water Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
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- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
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Images
Classifications
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- 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
- F24H8/00—Fluid heaters characterised by means for extracting latent heat from flue gases by means of condensation
-
- 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
- F23D14/66—Preheating the combustion air or gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- 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
- F24H9/0005—Details for water heaters
-
- 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
-
- 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
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
- F28B1/02—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser using water or other liquid as the cooling medium
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/24—Arrangements for promoting turbulent flow of heat-exchange media, e.g. by plates
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The embodiment of the application provides a porous medium burning hot water boiler, relates to the hot water boiler field. The porous medium combustion hot water boiler comprises a porous medium combustion head and a relatively closed combustion chamber, wherein the porous medium combustion head is arranged at one end of the combustion chamber, the combustion surface faces the combustion chamber, the combustion chamber is also provided with a smoke outlet, and smoke generated by the combustion surface of the combustion chamber flows to the smoke outlet in the combustion chamber; the combustion chamber is internally provided with a heat exchange pipe used for accommodating a heat exchange medium so as to realize heat exchange. The porous medium combustion hot water boiler has the advantages of compact structure, high heat efficiency, low NOx and CO emission and high safety, and realizes the economic benefit and the social benefit of energy conservation and emission reduction.
Description
Technical Field
The application relates to the field of hot water boilers, in particular to a porous medium combustion hot water boiler.
Background
The gas-fired hot water boiler is a boiler for producing hot water, and is a thermal energy device for heating water to a rated temperature by using heat energy released by fuel combustion or other heat energy (such as electric energy, solar energy and the like). At present, most of gas-fired hot water boilers have horizontal internal combustion structures, the flow direction of flue gas generated by fuel combustion is consistent with that of water media to be heated, and in order to heat water to a rated temperature, the size of the main structure is large so as to ensure the heat exchange area and time of the flue gas and the water media.
In addition, most of the existing gas-fired hot water boilers for realizing low-nitrogen combustion adopt an FGR flue gas external circulation technology and a full-premixing surface combustion technology, and have the defects of high exhaust gas temperature, high energy waste, low heat efficiency, potential safety hazards caused by tempering or blockage and the like. The FGR flue gas external circulation technology is difficult to realize low nitrogen and stability, and the flue gas resistance is increased after partial flue gas is pumped back, the power consumption rate is increased, and partial heat is lost. The full-premixing surface combustion technology needs to rely on a large amount of air to cool the combustion temperature so as to achieve low-nitrogen emission, but provides a large amount of excess air, which can not only increase the resistance of the flue gas of the boiler, but also reduce the heat efficiency of the boiler and the condensation dew point temperature of the flue gas, and because the surface combustion woven mesh is generally dense, the blockage can be easily caused, and the potential safety hazard is caused.
Disclosure of Invention
The embodiment of the application aims to provide the porous medium combustion hot water boiler which is compact in structure, high in heat efficiency, low in NOx and CO emission, high in safety and capable of achieving economic benefits and social benefits of energy conservation and emission reduction.
In a first aspect, an embodiment of the application provides a porous medium combustion hot water boiler, which comprises a porous medium combustion system and a relatively closed combustion chamber, wherein the porous medium combustion system is installed at one end of the combustion chamber, a combustion surface faces the combustion chamber, the combustion chamber is also provided with a smoke outlet, and smoke generated by the combustion surface of the combustion chamber can flow to the smoke outlet in the combustion chamber; the combustion chamber is internally provided with a heat exchange pipe used for accommodating a heat exchange medium so as to realize heat exchange.
In the implementation process, the porous medium combustion system is high in combustion rate and stability, low in NOx and CO emission, free of sacrificing heat efficiency to meet emission requirements, large in porosity of the porous medium, capable of avoiding potential safety hazards caused by blockage and high in safety. The porous medium combustion system is connected with the combustion chamber in a vertical plane, and the high-temperature flue gas generated by combustion directly heats the heat exchange tube in the combustion chamber, so that the heat exchange efficiency is high, the boiler is more compact, the size and the volume of the boiler can be reduced, and the emission of NOx and CO can be effectively reduced.
In one possible implementation mode, the porous medium combustion system is provided with a combustion head, the combustion head is arranged at one end of the combustion chamber, and the smoke outlet is arranged at the other end, far away from the porous medium combustion system, of the combustion chamber;
or the porous medium combustion system is provided with at least two combustion heads, the combustion heads are respectively arranged at two ends of the combustion chamber, and the smoke outlet is arranged in the middle of the combustion chamber.
In a possible realization, the bottom of the combustion chamber is provided with a flue gas condensate discharge opening.
In the implementation process, the flue gas condensation is beneficial to reducing the emission of NOx and CO, the flue gas condensate water discharge port timely discharges condensate water generated by the flue gas, equipment is protected, and the economic benefit and the social benefit of energy conservation and emission reduction are realized.
In a possible implementation manner, the porous medium combustion system comprises an air supply system, a fuel gas supply system and a porous medium combustion head which are arranged outside the combustion chamber, and the air supply system and the fuel gas supply system are connected with the porous medium combustion head.
In the implementation process, the air supply system is used for providing air, the gas supply system is used for providing gas, the air and the gas are conveyed into the porous medium combustion head to be combusted to generate high-temperature flue gas, and heat is output to the combustion chamber in the form of infrared combustion radiation.
In one possible implementation, the porous medium combustion head comprises an upstream layer and a downstream layer which are overlapped together, wherein the upstream layer is positioned at the upstream of the flowing direction of the smoke, and the downstream layer is positioned at the downstream of the flowing direction of the smoke;
optionally, fire-resistant insulation boards are arranged around the upstream layer and the downstream layer and are fixed together through the surrounding fire-resistant insulation boards;
optionally, the outermost peripheries of the upstream layer and the downstream layer are also provided with water-cooled walls;
optionally, the porous medium combustion head further comprises a gas homogenizing chamber close to the outside of the combustion chamber and a gas distribution device superposed on the upstream layer and used for uniformly distributing the mixed gas to the combustion surface.
In the implementation process, the upstream layer mainly realizes the preheating of combustion gas (mainly mixture of fuel gas and air), and the downstream layer realizes the combustion of the combustion gas, wherein the porosity of the upstream layer can be set to be relatively large, and the problems of blockage and the like similar to surface combustion cannot occur. Through gas homogenizing chamber, gas distribution device, can carry combustion gas evenly to downstream layer and low reaches layer and preheat and burn.
In one possible implementation manner, the heat exchange tube comprises a light tube group and a finned tube group which are arranged in sequence along the flow direction of the flue gas and used for containing water;
optionally, a spring turbulator is disposed inside the light pipe.
In the realization process, the heat exchange tube is formed by the light tube group and the finned tube group, high-temperature flue gas generated by combustion flows through the light tube group and the finned tube group, water contained in the light tube and the finned tube can absorb heat of the high-temperature flue gas and further obtain hot water, the smoke exhaust temperature is reduced, particularly the finned tube can increase flue gas disturbance and heat exchange area, the flue gas waste heat can be recycled deeply, the heat exchange efficiency is improved, and therefore the boiler efficiency is improved. As an implementation mode, the spring turbolator increases the water disturbance heat transfer efficiency and improves the heat exchange efficiency of the light pipe.
In a possible implementation mode, the heat exchanger further comprises a heat exchanger, the heat exchanger comprises a shell and a water pipe arranged in the shell, the heat exchange pipes are vertically arranged, the top ends of the heat exchange pipes are communicated with the inside of the shell, two ends of the water pipe are respectively communicated with a water return pipeline and a water outlet pipeline, the water return pipeline is used for supplying water into the water pipe, and the water outlet pipeline is used for outputting hot water in the water pipe;
optionally, an explosion-proof device is arranged on the housing; and/or the shell is provided with an exhaust vacuumizing port;
optionally, a temperature controller and a water level controller are arranged in the shell.
In the implementation process, water in the vertically arranged heat exchange pipes is heated by smoke, and generated steam rises into the shell above the combustion chamber, so that the water in the water pipe in the shell is heated to obtain hot water, and the overall structure is compact. The explosion-proof device can prevent the pressure in the shell from being over-pressurized, thereby preventing explosion; the exhaust vacuumizing port realizes vacuumizing or exhausting in the shell; the temperature controller and the water level controller can prevent overtemperature and water shortage in the operation of the boiler, and ensure the safe operation of the boiler.
In a possible implementation mode, a condenser is further arranged in the combustion chamber and is positioned between the heat exchange pipe and the smoke outlet; the water inlet of the water system of the condenser is communicated with the water return pipeline, and the water outlet of the water system of the condenser is communicated with the water pipe.
In the implementation process, the tail part of the combustion chamber is provided with the condenser, so that the waste heat of the flue gas can be deeply recycled, the heat efficiency of the boiler is improved, the flue gas condensation is favorable for reducing the emission of NOx and CO, and the purposes of energy conservation and emission reduction are achieved. The water system of the condenser is connected with the water system of the heat exchanger in a series connection mode, a water inlet of the water system of the condenser is communicated with a water return pipeline, and water input into the water system of the condenser through the water return pipeline is conveyed to the heat exchanger for further heating after being condensed and heat exchanged through flue gas.
In a possible implementation mode, the combustion chamber further comprises a water collecting tank arranged outside the combustion chamber in a surrounding mode, the heat exchange tubes are arranged horizontally, two ends of each heat exchange tube are respectively communicated with the water collecting tank, the water collecting tank is respectively provided with a water return port and a water outlet in a communicating mode, the water return port is used for supplying water into the water collecting tank, and the water outlet is used for outputting hot water in the water tank;
optionally, the porous medium combustion hot water boiler is of a vertical structure;
optionally, an exhaust port is arranged on the water collecting tank;
optionally, a water level detector is provided in the water collection tank.
In the implementation process, the horizontally arranged heat exchange tube is communicated with the water collecting tank and enters the heat exchange tube through the water return port, hot water is obtained through flue gas heating, and the hot water is conveyed out through the water outlet. The exhaust port is used for exhausting gas in the water collecting tank, so that the safe operation of the boiler is guaranteed; the water level detector is used to detect the water level in the water collecting tank so as to maintain a certain height. When the porous medium combustion hot water boiler is of a vertical structure, the whole structure is compact, and the occupied area is small.
In a possible implementation mode, the part of the water collecting tank, which is positioned at the two ends of the heat exchange tube, is divided into a water inlet collecting tank and a turning water chamber, and the heat exchange tube and the water collecting tank and/or the turning water chamber communicated with the two ends of the heat exchange tube form a circulating water path.
In the implementation process, the heat exchange tube and the water collection tank communicated with the two ends of the heat exchange tube and/or the water flow direction and the flue gas direction in which the circulating water channel is formed in the turning water chamber adopt countercurrent heat exchange, the heat transfer temperature difference is large, the heat efficiency is high, and the deep recycling of flue gas waste heat is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic structural view of a porous medium combustion hot water boiler according to a first embodiment of the present application;
FIG. 2 is a schematic structural view of the porous media burner head portion of FIG. 1;
fig. 3 is a schematic structural view of a porous medium combustion hot water boiler according to a second embodiment of the present application;
FIG. 4 is a schematic view of the structure of FIG. 3 from another perspective;
FIG. 5 is a schematic structural view of the porous medium burner head portion of FIG. 3.
Icon: 100-porous medium combustion hot water boiler; 110-a porous media combustion head; 111-gas homogenizing chamber; 112-a multi-well plate; 113-upstream layer; 114-downstream layer; 115-a refractory insulation board; 116-a temper proof panel; 120-a combustion chamber; 121-smoke outlet; 122-flue gas condensate water discharge port; 131-a light pipe; 132-a finned tube; 140-a heat exchanger; 141-a housing; 142-a water pipe; 143-return line; 144-water outlet pipeline; 145-explosion-proof device; 146-exhaust vacuum-pumping port; 147-temperature controller; 148-water level controller; 149-water level sight glass; 150-a condenser; 161-variable frequency fan; 162-a gas supply system; 163-gas mixer; 200-porous medium combustion hot water boiler; 210-a water collection tank; 211-a water return port; 212-water outlet; 213-a water inlet header; 214-turn water chamber; 215-an exhaust port; 220-porous media combustion head; 221-a venturi tube; 230-a spring turbulator; 241-a gas distribution plate; 242-water wall; 243-ignition electrode.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it is to be noted that the terms "upper", "lower", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally laid out when products of the application are used, and are only for convenience in describing the application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the application. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
First embodiment
Referring to fig. 1, the present embodiment provides a porous medium combustion hot water boiler 100, which is specifically a condensing vacuum hot water boiler. The vacuum hot water boiler forms a negative pressure vacuum environment in a closed furnace body, heat medium water is filled in the furnace body, the heat medium water is heated by combustion or other modes, then the heat medium water is evaporated and condensed to a heat exchanger, and then the heat exchanger heats water to be heated. The vacuum hot water boiler works by utilizing the characteristic that water has different boiling temperatures under different pressures, when the water is in a negative pressure working pressure state, combustion is carried out to ensure that the temperature of heat medium water is quickly raised to the saturation temperature, steam with the same temperature is generated on the water surface to heat cold water in a heat exchanger, the cold water in a heat exchanger pipe is heated by steam outside the pipe and then is conveyed to a user, and the steam outside the pipe is condensed into water drops to return to the water surface and then is heated, thereby completing the whole circulation process.
Based on the above description of the operating principle of the vacuum hot water boiler, the porous medium combustion hot water boiler 100 of the embodiment of the present application specifically includes a porous medium combustion system and a relatively closed combustion chamber 120, and a heat exchanger 140 is further disposed above the combustion chamber 120. The porous medium combustion system is arranged at one end of the combustion chamber 120, the combustion surface of the porous medium combustion head 110 is vertically arranged and faces the interior of the combustion chamber 120, the other end of the combustion chamber 120, which is far away from the porous medium combustion head 110, is provided with a smoke outlet 121, and smoke generated by the combustion surface of the combustion chamber 120 flows to the smoke outlet 121 in the combustion chamber 120; a heat exchange pipe for accommodating a heat exchange medium to realize heat exchange and a condenser 150 for deeply recycling flue gas waste heat are arranged in the combustion chamber 120; the bottom of the combustion chamber 120 is provided with a flue gas condensate water discharge port 122, the flue gas condensate water discharge port 122 is generally arranged at the tail of the combustion chamber 120, and the embodiment specifically is arranged below the condenser 150, so that condensate water generated by condensing flue gas is discharged in time.
As an alternative embodiment, the heat exchange tube includes a light tube group and a finned tube group which are arranged in sequence along the flow direction of the flue gas and are used for containing water, that is, the light tube group, the finned tube group and the condenser 150 for the waste heat of the flue gas are arranged in sequence along the flow direction of the flue gas in the combustion chamber 120.
It should be noted that the light pipe group is composed of a plurality of light pipes 131, and is generally composed of a plurality of light pipes 131 arranged in parallel and staggered; the finned tube group is composed of a plurality of finned tubes 132, and is generally composed of a plurality of finned tubes 132 which are arranged in parallel and staggered, wherein the finned tubes 132 in the example of the application are made of corrosion-resistant stainless steel or alloy steel. The vertical arrangement of the combustion surface refers to the orientation of the porous medium combustion hot water boiler 100 when it is placed in the forward direction, so as to ensure the normal operation.
Referring to fig. 1 and 2, in order to supply the combustion gas, the porous medium combustion system includes an air supply system, a gas supply system and a porous medium combustion head 110, which are disposed outside the combustion chamber, and the air supply system and the gas supply system are connected to the porous medium combustion head. As an embodiment, the air supply system is a fan, and specifically, may be a variable frequency fan 161. Namely, the porous medium combustion system further comprises a porous medium combustion head 110, and a variable frequency fan 161 and a fuel gas supply system 162 which are arranged outside the combustion chamber 120, wherein the variable frequency fan 161 and the fuel gas supply system 162 are respectively connected with the porous medium combustion head 110; in order to mix the gas and the air into the combustion gas in advance, the porous medium combustion system further comprises a gas mixer 163, the variable frequency fan 161 and the gas supply system 162 are respectively connected with the gas mixer 163, and the gas mixer 163 is connected with the porous medium combustion head 110. The air supply system and the gas supply system respectively convey air and gas into the gas mixer for mixing, and then convey the mixture into the porous medium combustion head 110 for combustion.
Referring to fig. 2, in the embodiment of the present application, one porous medium combustion head 110 of the porous medium combustion hot water boiler 100 is located at an end of the combustion chamber 120, and in other embodiments, the porous medium combustion system has at least two porous medium combustion heads 110, the porous medium combustion heads 110 are respectively installed at two ends of the combustion chamber, and the smoke outlet is arranged at the middle of the combustion chamber. The porous medium combustion head 110 is a planar burner, i.e. the combustion surface is a planar structure, and the porous medium combustion head 110 and the combustion chamber 120 are of an integrated combustion structure, i.e. the porous medium combustion head 110 and the water wall of the combustion chamber 120 are connected into a whole. The porous medium combustion head 110 comprises a gas homogenizing chamber 111 close to the outside of a combustion chamber 120, a gas distribution device (specifically a porous plate 112), an anti-tempering plate 116, an upstream layer 113 (namely a preheating layer) and a downstream layer 114 (namely a combustion layer) which are stacked together, wherein the upstream layer 113 is positioned at the upstream of the flow direction of flue gas, namely close to the outside of the combustion chamber 120, the downstream layer 114 is positioned at the downstream of the flow direction of flue gas, namely close to the inside of the combustion chamber 120, and the surface of the downstream layer 114 facing to the inside of the combustion chamber 120 is a combustion surface; the porous plate 112, the anti-backfire plate 116, the upstream layer 113 and the downstream layer 114 are provided with fire-resistant insulation boards 115 around their peripheries and fixed together by the surrounding fire-resistant insulation boards 115. Upstream layer 113 and/or downstream layer 114 include one or more of packed ceramic spheres, foam structural materials, honeycomb structural materials, array structural materials, and random fiber structural materials; the material of the upstream layer 113 and/or the downstream layer 114 includes alumina ceramic, zirconia ceramic, silicon carbide ceramic, iron-chromium-aluminum alloy, chromium-nickel alloy, or tungsten alloy.
Illustratively, the perforated plate 112, the temper shield 116, the upstream layer 113 and the downstream layer 114, and the refractory insulation plate 115, which are stacked together in the porous medium combustion head 110, are of a rectangular parallelepiped structure as a whole. The perforated plate 112 is made of stainless steel, and the aperture ratio is 20-30%; the tempering-proof plate 116 is made of ceramic aluminum silicate fiber board, the porosity is 20% -30%, and the hole diameter is 1.5-2 mm; the upstream layer 113 is an aluminum silicate plate; the downstream layer 114 is a silicon carbide foam/silicon carbide porous ceramic with a pore density of 10PPI and a porosity of 60%. The upstream layer is an aluminum silicate plate, the downstream layer is silicon carbide foam/silicon carbide porous ceramic, the combustion rate is high, the temperature is uniform, the stability is good, and the emission of NOx and CO is low.
In the embodiment of the application, the light pipes 131 of the light pipe group and the finned tubes 132 of the finned tube group are both vertically arranged, the porous medium combustion heads 110 are arranged in a plane, the combustion surface is parallel to the light pipes 131 and the finned tubes 132, and the porous medium combustion heads 110 can be continuously arranged on the left side and the right side of the combustion chamber 120 according to the power of the porous medium combustion heads 110. The light pipes 131 and the finned pipes 132 which are vertically arranged are uniformly heated, so that the heat exchange efficiency is high, and the emission of NOx and CO can be effectively inhibited.
In the embodiment of the present application, the heat exchanger 140 includes a housing 141 and a water pipe 142 disposed in the housing 141, the water pipe 142 is generally a stainless steel pipe or a copper pipe, the top ends of the light pipes 131 of the light pipe group and the finned tubes 132 of the finned tube group are both communicated with the housing 141, two ends of the water pipe 142 are respectively communicated with a water return pipeline 143 and a water outlet pipeline 144, the water return pipeline 143 is used for supplying water into the water pipe 142, and the water outlet pipeline 144 is used for delivering hot water in the water pipe 142 to a user. In one embodiment, explosion-proof device 145 is disposed on housing 141; an exhaust vacuum port 146 is arranged on the shell 141; a water level viewing mirror 149 for observing the water level in the housing 141 is further provided on the housing 141; a temperature controller 147 and a water level controller 148 are disposed in the housing 141.
In the embodiment of the present application, the water system of the condenser 150 and the water system of the heat exchanger 140 are connected in series: the water inlet of the water system of the condenser 150 is communicated with the water return line 143, and the water outlet of the water system of the condenser 150 is communicated with the water pipe 142 to deliver water to the heat exchanger 140. Optionally, the condenser 150 is a corrosion resistant finned tube 132 heat exchanger 140, specifically composed of corrosion resistant stainless steel or ND steel or the like finned tube 132.
The working process of the porous medium combustion hot water boiler 100 according to the embodiment of the present application is as follows:
the variable frequency fan 161 and the gas supply system 162 respectively convey air and gas to the gas mixer 163 to be mixed, and the mixed gas is conveyed to the downstream layer 114 of the porous medium combustion head 110 through the gas equalizing chamber 111 to be combusted to generate high-temperature flue gas, so that heat is output by infrared combustion radiation.
The high-temperature flue gas flows from one end of the combustion chamber 120 to the smoke outlet 121 at the other end and respectively passes through the optical tube group, the finned tube group and the condenser 150, refrigerant water in the optical tube group and the finned tube group is heated by the high-temperature flue gas to saturated steam with corresponding temperature, the saturated steam enters the shell 141 of the heat exchanger 140 to heat system water in the water pipe 142, water vapor outside the water pipe 142 in the heat exchanger 140 is cooled to form condensed water and returns to the optical tube group and the finned tube group to be circularly heated, and the smoke exhaust temperature of the high-temperature flue gas can be reduced to be lower than 100 ℃ after primary heat exchange of the optical tube group and the finned tube group; the system water in the water system of the condenser 150 is heated by the waste heat of the flue gas, the temperature of the flue gas is reduced to below 60 ℃, the flue gas is discharged from the smoke discharge port 121, and the condensed water after the flue gas is condensed is discharged from the flue gas condensed water discharge port 122.
The system water in the water return line 143 enters the water system of the condenser 150, is condensed and heat exchanged by the flue gas, and is then conveyed to the heat exchanger 140, is further heated by the steam generated by the light pipe 131 and the finned tube 132 to obtain hot water, and is then conveyed to the user through the water outlet line 144.
The porous medium combustion hot water boiler 100 provided by the embodiment of the application can reduce the smoke emission temperature to below 60 ℃, the thermal efficiency of the boiler is more than 97%, and the NOx emission is lower than 30mg/m3Belongs to an energy-saving and environment-friendly product.
Second embodiment
Referring to fig. 3 and 4, the present embodiment provides a porous medium combustion hot water boiler 200, which is specifically a gas-fired hot water boiler, that is, a boiler directly heating water by using heat of gas combustion to obtain hot water. The porous medium combustion hot water boiler 200 specifically includes a porous medium combustion head 220 and a relatively closed combustion chamber 120, and a water collection tank 210 enclosed outside the combustion chamber 120. The porous medium combustion head 220 is installed at one end of the combustion chamber 120, the combustion surface is vertically arranged and faces the interior of the combustion chamber 120, the other end of the combustion chamber 120, which is far away from the porous medium combustion head 220, is provided with a smoke exhaust port 121, and smoke generated by the combustion surface of the combustion chamber 120 flows to the smoke exhaust port 121 in the combustion chamber 120; a light tube group and a finned tube group for containing water are sequentially arranged in the combustion chamber 120 along the flow direction of the flue gas; the light pipe 131 and the finned tube 132 are respectively communicated with the water collecting tank 210 at two ends, the water collecting tank 210 is respectively communicated with a water return port 211 and a water outlet 212, the water return port 211 is used for supplying water into the water collecting tank 210, the water outlet 212 is used for delivering hot water in the water tank to a user for optional use, the water collecting tank 210 is provided with an exhaust port 215, and a water level detector is arranged in the water collecting tank 210; the bottom of the combustion chamber 120 is provided with a flue gas condensate water discharge port 122, and the flue gas condensate water discharge port 122 is specifically below the finned tube group, and can be matched with a collecting groove on an inclined plane to discharge condensate water after flue gas condensation in time.
Referring to fig. 5, the porous medium combustion head 220 of the embodiment of the present application is a planar burner, i.e. the combustion surface is a planar structure, the porous medium combustion head 220 and the combustion chamber 120 are an integrated combustion structure, and the connection manner of the combustion head and the body is a vertical plane connection. The porous medium combustion head 220 is constructed substantially the same as the porous medium combustion head 110 in the first embodiment, except that: the gas supply system 162 is connected with the variable frequency fan 161 through the venturi tube 221, the variable frequency fan 161 is connected with the porous medium combustion head 220, the gas supply system 162 conveys gas to the variable frequency fan 161 through the venturi tube 221, and the gas is stirred and mixed with air pumped in by the variable frequency fan 161 to obtain combustion gas, and then the combustion gas is conveyed into the porous medium combustion head 220 for combustion; the outermost peripheries of the upstream layer 113 and the downstream layer 114 are also provided with a water-cooled wall 242, and the water-cooled wall 242 can not only prevent the problem of forward heat conduction of the combustion temperature, but also reduce the combustion temperature of a hearth and effectively inhibit the generation of NOx; a gas distribution plate 241 is also arranged between the porous plate 112 and the gas equalizing chamber 111; an ignition electrode 243 is also provided and is located within the combustion chamber 120 adjacent the combustion face.
In the embodiment of the application, the light pipes 131 of the light pipe group and the finned tubes 132 of the finned tube group are both horizontally arranged, the horizontally arranged light pipes 131 and the horizontally arranged finned tubes 132 are uniformly heated, the heat exchange efficiency is high, and the emission of NOx and CO can be effectively inhibited. The light pipe group is composed of a plurality of light pipes 131 which are horizontally arranged in parallel and staggered; the finned tube group is composed of a plurality of finned tubes 132 which are horizontally arranged in parallel and staggered mode.
The porous medium combustion head 220 is arranged in a plane, and the combustion surface is parallel to the light pipe 131 and the finned pipe 132. The porous medium combustion heads 220 can be continuously arranged at the left side and the right side of the combustion chamber 120 according to the power of the porous medium combustion heads 220, and meanwhile, the boiler structure can also be arranged in a vertical structure, namely, the porous medium combustion heads 220 are combusted at the top end of the combustion chamber 120, the generated smoke flows downwards and exchanges heat through the light pipes 131 and the finned pipes 132 which are horizontally arranged, so that the whole structure is compact, and the size and the volume of the boiler are reduced.
In order to realize that the water in the water collecting tank 210 is circularly heated, the part of the water collecting tank 210 at the two ends of the light tube group and the fin tube group is divided into a water inlet collecting tank 213 and a turning water chamber 214, the light tubes 131 and the water inlet collecting tank 213 and/or the turning water chamber 214 communicated with the two ends thereof, and the finned tubes 132 and the water collecting tank and/or the turning water chamber 214 communicated with the two ends thereof form a circulating water path (a countercurrent heat exchange water system), and an external circulating pump is connected for circularly heating. Specifically, the light pipe 131 and the turning water chamber 214 communicated with both ends thereof form a circulation water path (counter-flow heat exchange water system), the finned tube 132 and the water header and the turning water chamber 214 communicated with both ends thereof form a circulation water path (counter-flow heat exchange water system), and the water flow direction in the counter-flow heat exchange water system is not consistent with the flow direction of the flue gas; the water flow direction input from the water inlet and output from the water outlet 212 is opposite to the flow direction of the flue gas, so that the heat exchange efficiency is ensured.
The working process of the porous medium combustion hot water boiler 200 of the embodiment of the present application is as follows:
the venturi 221 delivers air and fuel gas to the variable frequency fan 161 for mixing and stirring, and delivers the mixture to the downstream layer 114 of the porous medium combustion head 220 through the air equalizing chamber 111 for combustion to generate high temperature flue gas, which outputs heat by infrared combustion radiation.
The high-temperature flue gas flows from one end of the combustion chamber 120 to the smoke outlet 121 at the other end, and passes through the light tube group and the fin tube group respectively, the spring turbolator 230 is arranged in the light tube 131, the water medium in the tubes is disturbed, the water medium input into the tubes from the water inlet is heated by the high-temperature flue gas to reach the rated temperature, and then the high-temperature flue gas is connected to the water outlet 212 through a water path and is conveyed to a user for use. And the water system is a countercurrent heat exchange water system consisting of a water inlet header 213, a turning water chamber 214, a light pipe 131 and a finned tube 132 through heat exchange, and is externally connected with a circulating pump for circulating heating. After primary heat exchange of the optical tube group and the finned tube group, the temperature of the flue gas is reduced to 60 ℃, the flue gas is connected with a smoke outlet 121 and is discharged to the atmosphere, and condensed water after the flue gas is condensed is discharged from a flue gas condensed water discharge outlet 122.
The porous medium combustion hot water boiler 200 of the embodiment of the application can reduce the discharge temperature to below 60 ℃, the thermal efficiency of the boiler is more than 98%, and the NOx discharge is lower than 30mg/m3Belongs to an energy-saving and environment-friendly product.
To sum up, the porous medium combustion hot water boiler of the embodiment of the application has the advantages of compact structure, high thermal efficiency, low NOx and CO emission and high safety, and realizes the economic benefit and the social benefit of energy conservation and emission reduction.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A porous medium combustion hot water boiler is characterized by comprising a porous medium combustion system and a relatively closed combustion chamber, wherein the porous medium combustion system is installed at one end of the combustion chamber, the combustion surface of the porous medium combustion system faces the combustion chamber, the combustion chamber is further provided with a smoke exhaust port, and smoke generated by the combustion surface of the combustion chamber can flow to the smoke exhaust port in the combustion chamber; and a heat exchange pipe for accommodating a heat exchange medium to realize heat exchange is arranged in the combustion chamber.
2. The porous medium combustion hot water boiler according to claim 1, wherein the porous medium combustion system has a combustion head, the combustion head is installed at one end of the combustion chamber, and the smoke discharge port is provided at the other end of the combustion chamber away from the porous medium combustion system;
or the porous medium combustion system is provided with at least two combustion heads, the combustion heads are respectively arranged at two ends of the combustion chamber, and the smoke exhaust port is arranged in the middle of the combustion chamber.
3. The porous medium combustion hot water boiler according to claim 1, wherein a flue gas condensate water discharge port is provided at a bottom of the combustion chamber.
4. The porous medium combustion hot water boiler according to claim 1, wherein the porous medium combustion system comprises an air supply system, a gas supply system and a porous medium combustion head which are arranged outside the combustion chamber, and the air supply system and the gas supply system are connected with the porous medium combustion head.
5. The porous medium-fired hot water boiler according to claim 4, wherein the porous medium combustion head comprises an upstream layer and a downstream layer which are laminated together, the upstream layer being located upstream in the flow direction of the flue gas, the downstream layer being located downstream in the flow direction of the flue gas;
optionally, fire-resistant insulation boards are arranged around the upstream layer and the downstream layer and are fixed together through the surrounding fire-resistant insulation boards;
optionally, the outermost peripheries of the upstream layer and the downstream layer are also provided with water-cooled walls;
optionally, the porous medium combustion head further comprises a gas homogenizing chamber close to the outside of the combustion chamber and a gas distribution device superposed on the upstream layer and used for uniformly distributing the mixed gas to the combustion surface.
6. The porous medium-fired hot water boiler according to claim 1, wherein the heat exchange tubes comprise a light tube group and a finned tube group for containing water, which are arranged in this order in the flow direction of the flue gas;
optionally, a spring turbulator is disposed inside the light pipe.
7. The porous medium combustion hot water boiler according to claim 1 or 6, further comprising a heat exchanger, wherein the heat exchanger comprises a housing and a water pipe arranged in the housing, the heat exchange pipes are vertically arranged, the top ends of the heat exchange pipes are communicated with the interior of the housing, two ends of the water pipe are respectively communicated with a water return pipeline and a water outlet pipeline, the water return pipeline is used for supplying water into the water pipe, and the water outlet pipeline is used for outputting hot water in the water pipe;
optionally, an explosion-proof device is arranged on the housing; and/or an exhaust vacuum-pumping port is arranged on the shell;
optionally, a temperature controller and a water level controller are arranged in the shell.
8. The porous medium combustion hot water boiler according to claim 7, wherein a condenser is further provided in the combustion chamber, the condenser being located between the heat exchange tube and the smoke outlet; the water inlet of the water system of the condenser is communicated with the water return pipeline, and the water outlet of the water system of the condenser is communicated with the water pipe.
9. The porous medium combustion hot water boiler according to claim 1 or 6, further comprising a water collection tank enclosed outside the combustion chamber, wherein the heat exchange tubes are horizontally arranged, and both ends of the heat exchange tubes are respectively communicated with the water collection tank, the water collection tank is respectively communicated with a water return port and a water outlet, the water return port is used for supplying water into the water collection tank, and the water outlet is used for outputting hot water in the water tank;
optionally, the porous medium combustion hot water boiler is of a vertical structure;
optionally, an exhaust port is arranged on the water collecting tank;
optionally, a water level detector is arranged in the water collecting tank.
10. The porous medium combustion hot water boiler according to claim 9, wherein a portion of the header tank located at both ends of the heat exchange tube is divided into a water inlet header tank and a turn water chamber, and the heat exchange tube and the water header tank and/or the turn water chamber communicated with both ends thereof form a circulation water path.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010689508.2A CN111795497A (en) | 2020-07-15 | 2020-07-15 | Porous medium burning hot water boiler |
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| CN202010689508.2A CN111795497A (en) | 2020-07-15 | 2020-07-15 | Porous medium burning hot water boiler |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113720018A (en) * | 2021-08-25 | 2021-11-30 | 西安交通大学 | Low-nitrogen hot water boiler with replaceable sleeve type water-cooling burning head |
| CN114413478A (en) * | 2022-01-17 | 2022-04-29 | 中国市政工程华北设计研究总院有限公司 | Condensing type household gas water heater suitable for pure hydrogen source |
| US20230349591A1 (en) * | 2022-04-29 | 2023-11-02 | Xi'an Jiaotong University | Premixed low-nitrogen gas boiler |
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2020
- 2020-07-15 CN CN202010689508.2A patent/CN111795497A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113720018A (en) * | 2021-08-25 | 2021-11-30 | 西安交通大学 | Low-nitrogen hot water boiler with replaceable sleeve type water-cooling burning head |
| CN113720018B (en) * | 2021-08-25 | 2022-06-07 | 西安交通大学 | Low-nitrogen hot water boiler with replaceable sleeve type water-cooling burning head |
| CN114413478A (en) * | 2022-01-17 | 2022-04-29 | 中国市政工程华北设计研究总院有限公司 | Condensing type household gas water heater suitable for pure hydrogen source |
| US20230349591A1 (en) * | 2022-04-29 | 2023-11-02 | Xi'an Jiaotong University | Premixed low-nitrogen gas boiler |
| US11859867B2 (en) * | 2022-04-29 | 2024-01-02 | Xi'an Jiaotong University | Premixed low-nitrogen gas boiler |
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