CN112696676A - Flameless combustor or flameless combustor group with heat exchange system and application - Google Patents
Flameless combustor or flameless combustor group with heat exchange system and application Download PDFInfo
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- CN112696676A CN112696676A CN201911011218.6A CN201911011218A CN112696676A CN 112696676 A CN112696676 A CN 112696676A CN 201911011218 A CN201911011218 A CN 201911011218A CN 112696676 A CN112696676 A CN 112696676A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/12—Radiant burners
- F23D14/18—Radiant burners using catalysis for flameless combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
- F23C5/08—Disposition of burners
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
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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
- 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
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- 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
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
Abstract
The flameless combustor with the heat exchange system comprises a heat exchange mechanism and a catalyst, wherein the heat exchange mechanism is of a frame structure which is formed by metal pipes and is internally communicated, the catalyst is arranged on the heat exchange mechanism, the heat exchange mechanism and the catalyst form a hollow combustor, one end of the heat exchange mechanism is provided with a gas inlet of mixed gas of fuel gas and combustion-supporting gas, and the heat exchange mechanism is provided with a heat exchange medium inlet and a heat exchange medium outlet; the catalyst is in a porous catalyst structure. The catalyst is arranged on the heat exchange metal pipe fitting to form the combustor, so that the temperature of the catalyst is reduced through heat exchange in the flameless combustion process, the catalyst is protected, and the service life of the catalyst is prolonged; the flameless combustor, the fan and the gas valve form the combustor, so that the structure is simple, and the flexibility is strong; the heat exchange mechanism can be assembled with a boiler or a water heater for use, and the heat exchange mechanism of the boiler or the water heater can adopt a parallel or series structure, so that the heat exchange mechanism is easy to install and has high heat production quantity.
Description
Technical Field
The invention relates to the technical field of fuel burners, in particular to the technical field of catalytic combustion.
Background
Combustion can be divided into two categories depending on the presence or absence of visible flame: flame combustion and flameless combustion. Flame combustion has two fatal disadvantages: (1) flame combustion is an oxidation reaction of combustion substances under the participation of free radicals, and relates to gas-phase initiation of the free radicals (particularly oxygen free radicals), a part of electron excited state products are inevitably generated, energy is released in the form of visible light, the part of energy cannot be utilized and is lost, toxic and harmful gases such as formaldehyde, carbon monoxide (CO) and the like are generated due to incomplete combustion, and the fuel utilization rate is low. (2) The gas phase initiation of the free radicals enables nitrogen in the air to participate in combustion reaction to form toxic pollutants NOx, considerable incompletely combusted HC and CO are generated at low combustion efficiency, and the emission of the toxic pollutants NOx into the atmosphere can cause environmental pollution.
Most of the traditional burners adopt a flame combustion mode, and the mode has the problems of incomplete combustion of gas fuel, low heat efficiency, low fuel utilization rate, high CO emission concentration and the like.
Compared with flame combustion, flameless combustion can enable combustion to be performed more uniformly and stably, and local high temperature is avoided, so that the generation amount of nitrogen oxides is extremely low. Flameless combustion includes high temperature air flameless combustion and catalytic flameless combustion. High temperature air combustion utilizes high temperature air to heat fuel gas to exceed the autoignition temperature, so that flameless combustion occurs in a relatively wide area, local high temperature is avoided, and NOx emission is effectively reduced.
One of the effective ways to solve the inefficiency of flame combustion and high emission is catalytic combustion, which has the advantages of high combustion efficiency (low emission of CO and incompletely combusted HC), low combustion temperature (<1200 ℃, thus low emission of NOx), stable and controllable combustion process (by controlling catalytic reaction), and the like. Catalytic combustion is an oxidation reaction of low-carbon hydrocarbons on the surface of a catalyst, and is a combustion method mainly based on flameless combustion. The key to the application of catalytic combustion technology is the design, research and development of efficient catalytic combustors.
The catalytic combustion technology currently used in gas water heaters, gas boilers and other devices is roughly as followsTwo types are as follows: (1) the catalytic reactor is arranged at a flue gas outlet, and can remove NO in flue gas generated by the gas-fired boiler; the patent number is CN201810326008.5, Chinese patent named as a gas boiler nitrogen oxide high-efficiency control device and method, the flue gas outlet pipeline of the boiler body is communicated with a catalytic reaction device to process the flue gas; for example, the patent number is cn201711223180.x, and the name is: the catalytic reaction device and the gas water heater are in Chinese patent, and the catalytic reaction device is arranged in the shell (the catalytic reaction device is formed by arranging a catalyst on a ceramic substrate), so that the content of carbon monoxide in combustion flue gas is reduced. (2) Heating by heat generated by catalytic burners, e.g. KR1020010058836A
The korean patent publication, the combustion unit realizes a gas phase combustion reaction and a catalytic chemical reaction by providing a catalyst on a metal fiber and a carrier; JP09254970, JP コンバインド generator プラント, discloses a boiler in which a catalytic combustion device is installed in the boiler body to perform catalytic combustion; for example, in chinese patent No. 201711005587.5 entitled gas water heater and No. 201711018017.X entitled gas water heater, a preheating burner and a catalytic burner are provided in a water heater case.
The catalyst of the catalytic combustion device for the boiler or the water heater is arranged on the carrier or arranged in the shell of the boiler body and the shell of the water heater, so that the catalytic combustion device has a complex structure and poor flexibility; in addition, the catalyst generates high temperature during the combustion process, thereby affecting the stability and service life of the catalyst.
Disclosure of Invention
In order to solve the problems of the catalytic combustion device used by the existing boiler or water heater, the invention provides a flameless combustor with a heat exchange system.
The technical scheme adopted by the invention for realizing the purpose is as follows: the flameless combustor with the heat exchange system comprises a heat exchange mechanism and a catalyst, wherein the heat exchange mechanism is of a frame structure which is formed by metal pipes and is internally communicated, the catalyst is arranged on the heat exchange mechanism, the heat exchange mechanism and the catalyst form a hollow combustor, one end of the heat exchange mechanism is provided with a gas inlet of mixed gas of fuel gas and combustion-supporting gas, and the heat exchange mechanism is provided with a heat exchange medium inlet and a heat exchange medium outlet; the catalyst is in a porous catalyst structure.
The catalyst is wrapped and sealed in the hole of the heat exchange mechanism frame, or the catalyst is supported and mounted on the heat exchange mechanism frame.
The heat exchange mechanism is a hollow cylindrical or cylindrical structure formed by metal pipe fittings, and a catalytic converter is arranged on each surface of the cylindrical or cylindrical structure outside one side surface of the gas inlet 2.
The device comprises one or more combustors formed by a heat exchange mechanism and a catalyst, wherein the combustors formed by the heat exchange mechanism and the catalyst are nested, and one end of each combustor is provided with a common gas inlet.
The heat exchange medium is water or heat conducting oil.
The flameless combustor with the heat exchange system is a hollow closed cavity, part or all of the outer wall surface of the flameless combustor is formed by a catalyst or a heat exchange mechanism and the catalyst, and a gas inlet of a gas and combustion-supporting gas mixed gas is arranged on the outer wall surface of the closed cavity;
the catalyst is 1 or more than 2 block or plate-shaped porous catalyst structures; the heat exchange mechanism is of a frame structure with more than 2 metal pipe fittings communicated with each other to form a metal pipe heat exchanger, the more than 2 metal pipe fittings are communicated with each other, and a heat exchange medium inlet and a heat exchange medium outlet are arranged on the metal pipe heat exchanger;
at least two surfaces of the upper surface, the lower surface, the left surface, the right surface, the front surface and the back surface of each block-shaped or plate-shaped porous catalyst are provided with metal pipe fittings which are attached with the porous catalyst.
The flameless combustor is a hollow closed rectangular cylinder, one end face of the flameless combustor is an air inlet end face formed by an end plate with a through hole, the through hole is used as an air inlet, the other 5 end faces are formed by a frame surrounded by metal pipe fittings and a porous catalyst positioned in the metal pipe frame, the metal pipe fittings and the porous catalyst are positioned on the outer wall face of the cylinder, metal pipes in the metal pipe frame are communicated with each other to form a heat exchange mechanism, and the heat exchange mechanism is provided with a heat exchange medium inlet and a heat exchange medium outlet;
or, the flameless burner is a hollow closed cylinder, one bottom surface of the flameless burner is an air inlet end surface formed by an end plate with a through hole, the through hole is used as an air inlet, the other bottom surface and the side wall surface are formed by a frame surrounded by metal pipe fittings and a porous catalyst positioned in the metal pipe frame, and the metal pipe fittings and the porous catalyst are positioned on the other bottom surface and the side wall surface of the cylinder body; the metal tubes in the metal tube frame are communicated with each other to form a heat exchange mechanism, and a heat exchange medium inlet and a heat exchange medium outlet are arranged on the heat exchange mechanism.
The outer wall surfaces of the other 5 end surfaces except the air inlet end surface of the flameless combustor with the rectangular cylinder are all rectangles surrounded by metal pipe fittings, and 1 or more than 2 blocky or plate-shaped porous catalysts are arranged in the rectangles; when more than 2 porous catalysts are arranged, adjacent porous catalysts are separated by 1 metal pipe fitting;
or, the cylindrical flameless burner, another bottom metal pipe piece surround into a circle, the round is equipped with 1 or more than 2 block or plate porous catalysts inside; when more than 2 porous catalysts are arranged, adjacent porous catalysts are separated by 1 metal pipe fitting; the side wall surface is formed by sequentially spacing more than 2 blocky or plate-shaped porous catalysts and more than 2 metal pipe fittings; the metal tubes in the metal tube frame are communicated with each other to form a heat exchange mechanism, and a heat exchange medium inlet and a heat exchange medium outlet are arranged on the heat exchange mechanism.
The flameless burner is a hollow closed cylinder body,
the outer wall surface of the cylinder is provided with a gas inlet communicated with the inside of the cylinder, the outer wall surface of the cylinder is provided with more than 2 through holes, the through holes are filled with porous catalysts or porous catalysts and metal pipe fittings for sealing the through hole areas, and the sum of the areas of the through holes is more than 80 percent of the outer surface of the cylinder;
the catalyst is wrapped and sealed in a frame hole formed by the metal pipe fittings, or the catalyst is supported and mounted on a frame formed by the metal pipe fittings.
The porous catalyst is a blocky or platy porous monolithic catalyst or a granular catalyst filled in the hollow container, and gas through holes are formed in the container wall surfaces in the cavity of the flameless burner and outside the cavity;
the metal pipe fitting is a square or round metal pipe, and the central axis of the metal pipe fitting is parallel to the surface of the plate body of the porous catalyst; the width or diameter of the surface of the metal pipe vertical to the plate body is equivalent to the thickness of the porous catalyst plate body.
And water or heat conducting oil is filled in the metal tube heat exchanger to serve as a heat exchange medium.
A flameless burner group with a heat exchange system is characterized in that the flameless burner is a flameless burner sleeve group and is formed by sequentially nesting more than 2 flameless burners from inside to outside; adjacent gas inlets are sequentially connected in series from inside to outside; and the metal tube heat exchangers of different flameless combustors are sequentially connected in series or in parallel or in series-parallel.
The flameless combustor is a flameless combustor set and is formed by mutually nesting 2 flameless combustors; namely, one flameless burner is arranged in the cavity of the other flameless burner; adjacent gas inlets are sequentially connected in series from inside to outside; 2 flameless combustors are connected in series in sequence.
The application of the flameless burner or the flameless burner group in a gas water heater or a gas boiler.
The flameless combustor or the flameless combustor group is arranged in a gas water heater or a gas boiler, high-temperature gas is firstly introduced from a gas inlet, the catalyst is heated to red heat or above 600 ℃, then the high-temperature gas is switched into mixed gas of the gas water heater or the gas boiler and combustion-supporting gas to start catalytic flameless combustion, and the gas water heater or the gas boiler is heated.
According to the flameless combustor with the heat exchange system, the catalyst is arranged on the heat exchange metal pipe to form the combustor, so that the temperature of the catalyst is reduced through heat exchange in the flameless combustion process, the catalyst is protected, and the service life of the catalyst is prolonged; the flameless combustor and the fan form the combustor, so that the structure is simple, and the flexibility is strong; the heat exchange mechanism can be assembled with a boiler or a water heater for use, and the heat exchange mechanism of the boiler or the water heater can adopt a parallel or series structure, so that the heat exchange mechanism is easy to install and has high heat production quantity.
Drawings
FIG. 1 is a front view of a flameless combustor with a heat exchange system in a wrapped configuration according to an embodiment of the present invention.
FIG. 2 is a left side view of a flameless combustor with a heat exchange system in a wrapped configuration according to an embodiment of the present invention.
FIG. 3 is a right view of a flameless combustor with a heat exchange system in a wrapped configuration according to an embodiment of the present invention.
FIG. 4 is a front view of a flameless burner with a heat exchange system in a supporting structure according to a second embodiment of the present invention.
FIG. 5 is a left side view of a flameless burner with a heat exchange system in a secondary support structure according to an embodiment of the present invention.
FIG. 6 is a right view of a flameless burner with a heat exchange system in a supporting structure according to a second embodiment of the present invention.
Fig. 7 is a front view structural diagram of a double-layer flameless combustor with a heat exchange system in a three-pack structure according to an embodiment of the invention.
Fig. 8 is a left side view of a double-layer flameless burner with a heat exchange system in a three-pack structure according to an embodiment of the present invention.
Fig. 9 is a right view structural diagram of a double-layer flameless combustor with a heat exchange system in a three-pack structure according to an embodiment of the invention.
FIG. 10 is a front view of a flameless burner and boiler assembly with a heat exchange system according to the present invention.
In the figure: 1. the device comprises a heat exchange medium inlet 2, a mixed gas inlet 3, a heat exchange medium outlet 4, a catalyst 5, a heat exchange mechanism 6, a fan 7, a controller 8, an igniter 9, a gas nozzle 10, an air distributor 11, a smoke exhaust pipeline 12, a boiler 13, a boiler heat exchanger 14, a boiler heat exchanger heat exchange medium inlet 15, a boiler heat exchanger heat exchange medium outlet 16 and a proportional valve.
Detailed Description
In the first embodiment, a single-layer wrapped flameless combustor with a heat exchange system is shown in fig. 1-3 and comprises a heat exchange mechanism 5 and a catalyst 4, wherein the heat exchange mechanism 5 is a frame structure formed by metal pipes and communicated with the inside, the catalyst 4 is wrapped and hermetically mounted in a frame hole of the heat exchange mechanism 5, the heat exchange mechanism 5 and the catalyst 4 form a hollow combustor, one end of the heat exchange mechanism 5 is provided with a gas inlet 2 for a gas and combustion-supporting gas mixture, and the heat exchange mechanism 5 is provided with a heat exchange medium inlet 1 and a heat exchange medium outlet 3; the catalyst 4 is a porous catalyst structure. The heat exchange mechanism 5 is a hollow cylindrical or cylindrical structure formed by metal pipe fittings, and the catalytic converter 4 is arranged on each surface of the cylindrical or cylindrical structure outside one side surface of the gas inlet 2. The heat exchange medium is water or heat conducting oil.
The concrete structure is as follows:
the flameless combustor is a hollow closed rectangular cylinder, one end face of the flameless combustor is an air inlet end face formed by an end plate with a through hole, the through hole is used as an air inlet 2, the other 5 end faces are formed by a frame formed by metal pipe fittings and a porous catalyst positioned in the metal pipe frame, the metal pipe fittings and the porous catalyst are positioned on the outer wall face of the cylinder, metal pipes in the metal pipe frame are communicated with each other to form a heat exchange mechanism 5, and the heat exchange mechanism 5 is provided with a heat exchange medium inlet 1 and a heat exchange medium outlet 3. The outer wall surfaces of other 5 end surfaces except the air inlet end surface of the flameless combustor with the rectangular cylinder are all rectangles surrounded by metal pipe fittings, and 2 flat-plate-shaped porous monolithic catalysts are arranged in the rectangles; adjacent porous catalysts were separated by 1 metal tube.
In the second embodiment, the single-layer supported flameless combustor with the heat exchange system is shown in fig. 4-6 and comprises a heat exchange mechanism 5 and a catalyst 4, wherein the heat exchange mechanism 5 is a frame structure formed by metal pipes and communicated with the inside, the catalyst 4 is supported and mounted on a frame of the heat exchange mechanism 5, the heat exchange mechanism 5 and the catalyst 4 form a hollow combustor, one end of the heat exchange mechanism 5 is provided with a gas inlet 2 for a gas and combustion-supporting gas mixture, and the heat exchange mechanism 5 is provided with a heat exchange medium inlet 1 and a heat exchange medium outlet 3; the catalyst 4 is a porous catalyst structure. The heat exchange mechanism 5 is a hollow cylinder structure formed by metal pipe fittings, and the catalytic converter 4 is arranged on each surface of the cylinder structure outside one side surface of the gas inlet 2. The heat exchange medium is water or heat conducting oil.
The concrete structure is as follows:
the flameless combustor is a hollow closed rectangular cylinder, one side end face of the flameless combustor is an air inlet end face formed by an end plate with a through hole, the through hole is used as an air inlet 2, the other 5 end faces except the air inlet end face are metal wall faces, a catalytic converter 4 is arranged on each metal wall face, each side face of four side faces is provided with 2 flat-plate-shaped porous monolithic catalysts, and 2 adjacent porous catalysts are spaced by the metal wall faces. The bottom surface is provided with 1 flat-plate-shaped porous monolithic catalyst, the heat exchange mechanism 5 is an upper layer structure and a lower layer structure which are surrounded by mutually communicated metal pipe fittings, the catalyst 4 is clamped between the upper layer metal pipe fitting and the lower layer metal pipe fitting, the inner layer metal pipe fitting supports the edge of the flat-plate-shaped porous monolithic catalyst, the outer layer metal pipe fitting is clamped in the middle part of the flat-plate-shaped porous monolithic catalyst, and the heat exchange mechanism 5 is provided with a heat exchange medium inlet 1 and a heat exchange medium outlet 3.
In the third embodiment, the double-layer supporting flameless combustor with the heat exchange system is as shown in fig. 7-9, and includes two combustors composed of a heat exchange mechanism 5 and a catalyst 4, the two combustors are nested, a common gas inlet 2 is arranged at one end of the combustor, the heat exchange mechanism 5 is a frame structure formed by metal pipes and communicated with the inside, the catalyst 4 is wrapped and sealed in a frame hole of the heat exchange mechanism 5, the heat exchange mechanism 5 and the catalyst 4 form a hollow combustor, a communicating or independent structure is arranged between the heat exchange mechanisms 5 of the two-layer combustor, if the two-layer heat exchange mechanism 5 is a communicating structure, a heat exchange medium inlet 1 and a heat exchange medium outlet 3 are shared, and if the two-layer heat exchange mechanism 5 is an independent structure, the heat exchange mechanism 5 is respectively provided with a heat exchange medium inlet 1 and a heat exchange medium outlet 3.
The concrete structure is as follows:
the flameless combustor is characterized in that two hollow and closed rectangular cylinders share one end face and are nested together, a through hole is arranged on the end face to serve as a gas inlet 2, the outsides of the other 5 end faces of the inner and outer rectangular cylinders are composed of a frame formed by metal pipe fittings and a porous catalyst positioned in the metal pipe frame, the metal pipe fittings and the porous catalyst are positioned on the outer wall face of the cylinder, metal pipes in the inner and outer metal pipe frames are communicated with each other to form a heat exchange mechanism 5, and a heat exchange medium inlet 1 and a heat exchange medium outlet 3 are arranged on the heat exchange mechanism 5. The outer wall surfaces of the other 5 end surfaces except the air inlet end surface on the inner layer rectangular cylinder body are all rectangles surrounded by metal pipe fittings, and 2 flat-plate-shaped porous monolithic catalysts are arranged in the rectangles; adjacent porous catalysts were separated by 1 metal tube. And 6 flat-plate-shaped porous monolithic catalysts are arranged in each side surface on 4 side surfaces of the outer layer rectangular cylinder body, adjacent porous catalysts are separated by 1 metal pipe fitting, 4 flat-plate-shaped porous monolithic catalysts are arranged on the end surface of the outer layer rectangular cylinder body opposite to the end surface provided with the air inlet 2, and adjacent porous catalysts are separated by 1 metal pipe fitting.
In the fourth embodiment, as shown in fig. 10, a mounting structure of a flameless combustor with a heat exchange system in a boiler is that first, a mixed gas inlet 2 of the flameless combustor with a heat exchange system of the present invention is hermetically connected with an air outlet channel of a fan 6 to form a burner, the fan 6 is a blower, an air outlet channel of the fan 6 is connected with a gas pipeline, a gas nozzle 9, an igniter 8 and an air distributor 10 are installed in a channel formed between an air outlet of the fan 6 and the mixed gas inlet 2 of the flameless combustor, and the gas nozzle 9 is located at an outlet of the gas pipeline. Install the combustor on boiler 12 from 12 one end of boiler, make the combustor of combustor be located 12 inside the boiler, the boiler is inside to be equipped with boiler heat exchanger 13, and boiler 12 connects smoke exhaust pipe 11, and flameless combustor's heat transfer mechanism 5 has two kinds of package assembly with boiler heat exchanger 13: (1) the metal pipe of the heat exchange means 5 of the flameless burner is connected in series with the pipe of the boiler heat exchanger 13, i.e. both have a common medium inlet and medium outlet, such as: a heat exchange medium inlet 1 of the combustor is used as a medium inlet, a heat exchange medium outlet 3 of the combustor is connected with a heat exchange medium inlet 14 of the boiler heat exchanger, and a heat exchange medium outlet 15 of the boiler is used as a total medium outlet. (2) The metal pipe of the heat exchange mechanism 5 of the flameless combustor is connected with the pipeline of the boiler heat exchanger 13 in parallel, namely the heat exchange mechanism 5 of the flameless combustor and the pipeline of the boiler heat exchanger 13 are arranged independently and are respectively provided with a medium inlet and a medium outlet. In the above embodiment, the catalyst 4 has a monolithic catalyst structure or a structure in which a catalyst is filled in a container having pores densely distributed in the wall thereof. The air distributor 10 is a device for uniformly mixing the gases, such as a porous plate-like structure.
The principle is as follows: the proportion of combustion-supporting gas and gas is adjusted through a fan 6 and a proportional valve 16, the combustion-supporting gas and the gas are uniformly mixed through an air distributor 10, the mixed gas enters a hollow cavity of a catalytic combustor through a gas inlet 2 and is ignited through an igniter 8 (ignition electrode), the gas is combusted to heat a catalytic converter 4, the flame of the gas is controlled to be extinguished when the temperature of the catalytic converter reaches a temperature higher than a catalytic ignition temperature, the mixed gas of the combustion-supporting gas and the gas penetrates through holes of a catalyst to perform flameless catalytic combustion on the surface of the catalyst, heat is released, a dotted line in the figure is the mixed gas flow direction of the gas and the combustion-supporting gas, and the air inlet amount of the fan 6 and the on-off of a. The catalyst 4 is cooled by the heat exchange mechanism 5 of the burner to cool the catalyst, and heat generated by the burner is exchanged by the boiler heat exchanger 13.
While the invention has been described with reference to exemplary embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. The flameless combustor with the heat exchange system is characterized in that:
the gas-combustion-supporting gas-liquid separator is a hollow closed cavity, part or all of the outer wall surface of the hollow closed cavity is formed by a catalytic converter (4) or a heat exchange mechanism (5) and the catalytic converter (4), and a gas inlet (2) for mixed gas of fuel gas and combustion-supporting gas is formed in the outer wall surface of the closed cavity;
the catalyst (4) is a block-shaped or plate-shaped porous catalyst structure with 1 or more than 2; the heat exchange mechanism (5) is of a frame structure with more than 2 metal pipe fittings communicated with each other to form a metal pipe heat exchanger, the more than 2 metal pipe fittings are communicated with each other, and a heat exchange medium inlet (1) and a heat exchange medium outlet (3) are arranged on the metal pipe heat exchanger;
at least two surfaces of the upper surface, the lower surface, the left surface, the right surface, the front surface and the back surface of each block-shaped or plate-shaped porous catalyst are provided with metal pipe fittings which are attached with the porous catalyst.
2. The flameless combustor with a heat exchange system according to claim 1, wherein:
the flameless combustor is a hollow closed rectangular cylinder, one end face of the flameless combustor is an air inlet end face formed by an end plate with a through hole, the through hole is used as an air inlet (2), the other 5 end faces are formed by a frame surrounded by metal pipe fittings and a porous catalyst positioned in a metal pipe frame, the metal pipe fittings and the porous catalyst are positioned on the outer wall face of the cylinder, metal pipes in the metal pipe frame are communicated with each other to form a heat exchange mechanism (5), and a heat exchange medium inlet (1) and a heat exchange medium outlet (3) are arranged on the heat exchange mechanism (5);
or, the flameless burner is a hollow closed cylinder, one bottom surface of the flameless burner is an air inlet end surface formed by an end plate with a through hole, the through hole is used as an air inlet (2), the other bottom surface and the side wall surface are formed by a frame surrounded by metal pipe fittings and a porous catalyst positioned in the metal pipe frame, and the metal pipe fittings and the porous catalyst are positioned on the other bottom surface and the side wall surface of the cylinder body; the metal tubes in the metal tube frame are communicated with each other to form a heat exchange mechanism (5), and a heat exchange medium inlet (1) and a heat exchange medium outlet (3) are arranged on the heat exchange mechanism (5).
3. The flameless combustor with a heat exchange system according to claim 2, wherein:
the outer wall surfaces of the other 5 end surfaces except the air inlet end surface of the flameless combustor with the rectangular cylinder are all rectangles surrounded by metal pipe fittings, and 1 or more than 2 blocky or plate-shaped porous catalysts are arranged in the rectangles; when more than 2 porous catalysts are arranged, adjacent porous catalysts are separated by 1 metal pipe fitting;
or, the cylindrical flameless burner, another bottom metal pipe piece surround into a circle, the round is equipped with 1 or more than 2 block or plate porous catalysts inside; when more than 2 porous catalysts are arranged, adjacent porous catalysts are separated by 1 metal pipe fitting; the side wall surface is formed by sequentially spacing more than 2 blocky or plate-shaped porous catalysts and more than 2 metal pipe fittings; the metal tubes in the metal tube frame are communicated with each other to form a heat exchange mechanism (5), and a heat exchange medium inlet (1) and a heat exchange medium outlet (3) are arranged on the heat exchange mechanism (5).
4. The flameless combustor with a heat exchange system according to claim 1, wherein: the flameless burner is a hollow closed cylinder body,
the outer wall surface of the cylinder is provided with a gas inlet (2) communicated with the inside of the cylinder, the outer wall surface of the cylinder is provided with more than 2 through holes, the through holes are filled with porous catalysts or porous catalysts and metal pipe fittings for sealing the through hole areas, and the sum of the areas of the through holes is more than 80 percent of the outer surface of the cylinder;
the catalyst is wrapped and sealed in a frame hole formed by the metal pipe fittings, or the catalyst is supported and mounted on a frame formed by the metal pipe fittings.
5. The flameless combustor with a heat exchange system according to any one of claims 1 to 4, wherein:
the porous catalyst is a blocky or platy porous monolithic catalyst or a granular catalyst filled in the hollow container, and gas through holes are formed in the container wall surfaces in the cavity of the flameless burner and outside the cavity;
the metal pipe fitting is a square or round metal pipe, and the central axis of the metal pipe fitting is parallel to the surface of the plate body of the porous catalyst; the width or diameter of the surface of the metal pipe vertical to the plate body is equivalent to the thickness of the porous catalyst plate body.
6. The flameless combustor with a heat exchange system according to any one of claims 1 to 5, wherein:
and water or heat conducting oil is filled in the metal tube heat exchanger to serve as a heat exchange medium.
7. The utility model provides a flameless combustor group with heat transfer system which characterized in that: the flameless combustor is a flameless combustor set and is formed by sequentially nesting 2 flameless combustors according to any one of claims 1 to 6 from inside to outside; the adjacent gas inlets (2) are sequentially connected in series from inside to outside; the metal tube heat exchangers of the flameless burner of any one of claims 1 to 6 are connected in series, in parallel, or in series-parallel.
8. The flameless burner group with a heat exchange system according to claim 7, wherein: the flameless combustor is a flameless combustor set and is formed by mutually nesting 2 flameless combustors according to any one of claims 1 to 6; a flameless burner according to any one of claims 1 to 6 is disposed in a chamber of a flameless burner according to any one of claims 1 to 6; the adjacent gas inlets (2) are sequentially connected in series from inside to outside; 2 flameless burners according to any one of claims 1 to 6 connected in series.
9. Use of a flameless burner according to any one of claims 1 to 6 or of a group of flameless burners according to claim 7 or 8 in a gas water heater or a gas boiler.
10. Use of a flameless burner or group of flameless burners according to claim 9, characterized in that: the flameless combustor or the flameless combustor group according to claim 7 or 8 is placed in a gas water heater or a gas boiler, high-temperature gas is firstly introduced from a gas inlet (2), a catalyst (4) is heated to red heat or above 600 ℃, then the high-temperature gas is switched into mixed gas of the gas water heater or the gas boiler and combustion-supporting gas to start catalytic flameless combustion, and the gas water heater or the gas boiler is heated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911011218.6A CN112696676A (en) | 2019-10-23 | 2019-10-23 | Flameless combustor or flameless combustor group with heat exchange system and application |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911011218.6A CN112696676A (en) | 2019-10-23 | 2019-10-23 | Flameless combustor or flameless combustor group with heat exchange system and application |
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| CN112696676A true CN112696676A (en) | 2021-04-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911011218.6A Pending CN112696676A (en) | 2019-10-23 | 2019-10-23 | Flameless combustor or flameless combustor group with heat exchange system and application |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114877320A (en) * | 2022-05-27 | 2022-08-09 | 浙江大学 | Movable heating device based on methanol combustion reaction |
-
2019
- 2019-10-23 CN CN201911011218.6A patent/CN112696676A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114877320A (en) * | 2022-05-27 | 2022-08-09 | 浙江大学 | Movable heating device based on methanol combustion reaction |
| CN114877320B (en) * | 2022-05-27 | 2024-01-26 | 浙江大学 | Movable heating device based on methanol combustion reaction |
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