CN108954799B - Combustion heat exchange device, gas wall-mounted furnace and gas water heater - Google Patents

Combustion heat exchange device, gas wall-mounted furnace and gas water heater Download PDF

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Publication number
CN108954799B
CN108954799B CN201810916243.8A CN201810916243A CN108954799B CN 108954799 B CN108954799 B CN 108954799B CN 201810916243 A CN201810916243 A CN 201810916243A CN 108954799 B CN108954799 B CN 108954799B
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China
Prior art keywords
combustion
heat exchange
air
gas
inlet
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CN108954799A (en
Inventor
孟宪超
梁国荣
钱晓林
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Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
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Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/0027—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters using fluid fuel
    • 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
    • F23D14/68—Treating the combustion air or gas, e.g. by filtering, or moistening
    • 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
    • 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 invention provides a combustion heat exchange device, a gas wall-mounted furnace and a gas water heater, wherein the combustion heat exchange device comprises: the combustion cavity is provided with an air inlet and a gas inlet, and the gas inlet is used for being connected with a gas source; an air preheater having an inlet connected to external air and an outlet connected to the air inlet for preheating air entering from the inlet and discharging the preheated air into the combustion chamber through the outlet after the air is preheated to a preset temperature. By adopting the technical scheme of the invention, the combustion reaction can be promoted to be continuously carried out, the combustion is complete, the pollutant generation amount of NOx, CO and the like is extremely low, the noise is extremely low, the combustion temperature is improved, and the radiation heat exchange is enhanced.

Description

Combustion heat exchange device, gas wall-mounted furnace and gas water heater
Technical Field
The invention relates to the field of combustion heat exchange, in particular to a combustion heat exchange device, a gas wall-mounted furnace and a gas water heater.
Background
The working principle of the gas water heater is as follows: the high-temperature flue gas is generated by combustion of the burner, heat energy is conducted from the high-temperature flue gas to water by the heat exchanger, and finally hot water is generated. Therefore, the heat exchange efficiency of the gas water heater is one of the important technical indexes.
At present, the main combustion mode of the existing gas water heater is common atmospheric combustion, staged combustion or full premix combustion. However, the above combustion method has problems of insufficient combustion of fuel gas, large heat energy loss, low heat efficiency, high emission of pollutants (such as NOx and CO) in combustion exhaust gas, and poor combustion stability.
Disclosure of Invention
In order to solve at least one of the above problems, an object of the present invention is to provide a combustion heat exchange device.
The invention further aims to provide a gas wall-mounted furnace with the combustion heat exchange device.
It is still another object of the present invention to provide a gas water heater having the above combustion heat exchange device.
To achieve the above object, an embodiment of a first aspect of the present invention provides a combustion heat exchange device, including: the combustion cavity is provided with an air inlet and a gas inlet, and the gas inlet is used for being connected with a gas source; an air preheater having an inlet connected to external air and an outlet connected to the air inlet for preheating air entering from the inlet and discharging the preheated air into the combustion chamber through the outlet after the air is preheated to a preset temperature.
The invention provides a combustion heat exchange device which comprises a combustion cavity and an air preheater. Specifically, an air inlet and a gas inlet connected to a gas source are formed in the combustion cavity, and the gas source is used for providing gas into the gas cavity. The air preheater has an inlet connected to the outside air and an outlet connected to the air inlet, and by providing the air preheater, the air entering the air preheater from the inlet can be preheated and after the air is preheated to a preset temperature, the air preheated to the preset temperature can be discharged into the combustion chamber through the outlet. Through the scheme, high-temperature air can be input into the combustion cavity from the air inlet, so that the combustion reaction is facilitated to be continuously carried out, the combustion heat exchange device has the advantages of being transparent in the combustion cavity, free of local high-temperature flame, low in reaction rate, small in local heat release, uniform in heat flow distribution, low in combustion peak temperature and sufficient in combustion, the pollutant generation amount of NOx, CO and the like is extremely low, the noise is extremely low, the overall temperature in the combustion cavity is increased, and the radiation heat exchange is enhanced.
Wherein, alternatively, the preset temperature is greater than or equal to 700 ℃ and less than or equal to 1600 ℃, for example, the preset temperature may be 700 ℃, 900 ℃, 1200 ℃, 1400 ℃, or 1600 ℃. After the air with the preheating temperature enters the combustion cavity, the air has a better preheating effect on the fuel gas.
In addition, the combustion heat exchange device in the embodiment provided by the invention can also have the following additional technical characteristics:
in the above technical scheme, preferably, the combustion chamber is provided with a first smoke outlet, and the combustion heat exchange device further comprises: the smoke hood is buckled on the first smoke outlet, and a second smoke outlet is formed in the smoke hood; the first heat exchange water pipe is arranged in the smoke hood and is positioned between the first smoke outlet and the second smoke outlet.
In this scheme, burning heat transfer device still includes petticoat pipe and first heat exchange water pipe, has offered first exhaust port on through burning the cavity, has offered the second exhaust port on the petticoat pipe, and in the petticoat pipe was located to first heat exchange water pipe, and be located between first exhaust port and the second exhaust port, can utilize the high temperature flue gas of discharging in the burning cavity, through the heat transfer of convection mode with the flue gas to first heat exchange water pipe to realize heating the rivers in the first heat exchange water pipe. Through the scheme, the high-temperature flue gas in the combustion cavity can be recycled, so that energy sources are saved, and the heat exchange effect is improved.
In any of the above solutions, preferably, the method further includes: the second heat exchange water pipe is arranged on the inner surface of the combustion cavity; the combustion heat exchange device is provided with a cold water inlet and a hot water outlet, and the second heat exchange water pipe and the first heat exchange water pipe are connected in series between the cold water inlet and the hot water outlet.
In this scheme, through setting up the second heat exchange water pipe on the internal surface of burning cavity, can be with the heat transfer to the second heat exchange water pipe that produces when the combustion of gas mode to the heat exchange efficiency is high. The second heat exchange water pipe and the first heat exchange water pipe are connected in series between the cold water inlet and the hot water outlet, so that water flow entering from the cold water inlet can flow out from the hot water outlet after being heated by the first heat exchange water pipe and the second heat exchange water pipe, secondary heat exchange is realized, and the combustion heat exchange device has the advantages of high heating speed and high heating efficiency and can be used for rapidly providing hot water for users.
In any of the above technical solutions, preferably, the first smoke outlet is located at the top of the combustion chamber, and the air inlet and the gas inlet are both located at the bottom of the combustion chamber.
In this scheme, be located the top of burning cavity through first exhaust port, air inlet and gas inlet all are located the bottom of burning cavity, make gas and high temperature air get into behind the burning cavity and can mix rapidly on the one hand, have the short and concentrated effect of flame. On the other hand, the flue gas after fully burning in the messenger fires the cavity can be discharged outside the combustion cavity from first exhaust port, is favorable to reducing the pressure in the combustion cavity, and the flue gas can be better dilute the air of keeping away from the air inlet side, makes gas burning abundant, and the heat transfer effect is more stable.
In any of the above embodiments, preferably, the aperture of the first smoke outlet is smaller than the aperture of the air inlet.
In this scheme, through the bore of first exhaust port being less than the bore of air inlet for the flue gas can circulate in the burning cavity, is favorable to further diluting the air in the burning cavity, makes the gas burn under the low oxygen dilution condition, is favorable to reducing the content of pollutants such as NOx and CO in the flue gas.
In any of the above solutions, preferably, the method further includes: the heat exchange fins are sleeved on the first heat exchange water pipe, and a space is reserved between every two adjacent heat exchange fins.
In this scheme, through suit a plurality of heat transfer fins on first heat transfer water pipe to set up and leave the interval between every two adjacent heat transfer fins, further improved the convection heat transfer effect, in the rivers that make in the flue gas heat transfer to first heat transfer water pipe that can be better, with heating the rivers in the first heat transfer water pipe fast, high-efficient.
In any of the above technical solutions, preferably, the caliber of the gas inlet is smaller than the caliber of the air inlet; and/or the number of the gas inlets is multiple, the multiple gas inlets are sequentially arranged along the circumferential direction of the air inlet, and a space is reserved between every two adjacent gas inlets.
In this scheme, through the bore of air inlet being greater than the bore of gas import, further improved the entrainment effect of air to the gas, make the gas of each gas import department can mix with air fast and evenly. The number of the gas inlets is multiple, the multiple gas inlets are sequentially arranged along the circumferential direction of the air inlet, and a space is reserved between every two adjacent gas inlets, so that the gas and the air at each gas inlet can be quickly and uniformly mixed by utilizing the entrainment effect of the air when entering the combustion cavity, the reaction rate is improved, and the heat flow distribution is uniform.
In any of the above solutions, preferably, the method includes: the fan comprises an air channel connected with the air preheater and a wind wheel arranged in the air channel, and the fan is used for enabling air preheated to a preset temperature in the air preheater to enter the combustion cavity from the air inlet at a preset speed.
In this scheme, the burning heat transfer device still includes the fan, and the fan includes the wind channel of being connected with air preheater to and locate the wind wheel in the wind channel, through setting up the fan, can make the air that preheats to preset temperature in the air preheater get into the burning cavity with the air inlet in the speed of predetermineeing, thereby can realize further the flue gas in the entrainment burning cavity through the air jet, make the flue gas can be at the inside violent circulation of burning cavity, with the air in the further dilution burning cavity of the flue gas that utilizes the circulation.
In particular, the gas and air can mix rapidly after entering the combustion chamber, converging into a high concentration reactant stream, the flame observed after ignition being short and concentrated. Further, the air jet with the preset speed can entrain the smoke in the combustion cavity, so that the smoke can circulate in the combustion cavity, thereby diluting the air and enabling the oxygen concentration in the air to be lower than 5% -10%. The gas can be preheated by using air with the temperature of more than about 700 ℃ and high-temperature smoke gas flowing circularly, and the temperature of the gas is raised to be above the ignition point, so that the combustion reaction is promoted to be continuously carried out. The combustion peak temperature is low, the overall average temperature is improved, the temperature distribution is uniform, the heat exchange of the combustion cavity is enhanced, and the emission of NOx and CO is extremely low.
It is noted that the pollutant content such as NOx and CO in the flue gas discharged from the first flue gas outlet is extremely low, and by this combustion heat exchange device, NOx emission can be reduced by seventy percent or more, and thermal efficiency can be improved by thirty percent or more.
In any of the above technical solutions, preferably, the preset temperature is greater than or equal to 700 ℃ and less than or equal to 1600 ℃; and/or the preset speed is greater than or equal to 60m/s and less than or equal to 100m/s.
In this embodiment, the predetermined temperature is greater than or equal to 700 ℃ and less than or equal to 1600 ℃, such as 700 ℃, 900 ℃, 1200 ℃, 1400 ℃, or 1600 ℃, to facilitate the combustion reaction in the combustion chamber. By having a preset speed of greater than or equal to 60m/s and less than or equal to 90m/s, for example a preset speed of 60m/s, 75m/s, 80m/s, 85m/s or 90m/s, when air is injected into the combustion chamber from the air inlet, entrainment of the flue gas in the combustion chamber can be achieved, so that the flue gas can flow vigorously in the combustion chamber in a circulating manner, and the effect of diluting the air jet and further preheating the fuel gas is achieved.
In any of the above solutions, preferably, the number of combustion chambers is plural, and the plural combustion chambers are divided into at least two heat source groups, each of which includes at least one combustion chamber; the number of air preheaters is the same as the number of heat source groups, and the outlet of each air preheater is connected to the air inlets of all combustion cavities in one heat source group.
In this scheme, through the quantity of burning cavity for a plurality of, a plurality of burning cavity divide into two at least heat source group, and every heat source group includes at least one burning cavity to and the quantity of air heater is the same with the quantity of heat source group, and the export of every air heater is connected to the air inlet on all burning cavities in a heat source group simultaneously, constitutes a plurality of parallelly connected heat transfer module (every heat transfer module includes an air heater and a heat source group that correspond to be connected), thereby can carry out the combination formula to the heat transfer module according to different load demands and select, be favorable to practicing thrift the energy consumption, improved combustion heat transfer device's practicality by a wide margin.
Wherein, alternatively, the number of the combustion cavities in each heat source group may be the same or different, for example, each heat source group may include two combustion cavities, or one heat source group may include two combustion cavities, and the other heat source group may include three combustion cavities.
It can be understood that the heat exchange capacity of the heat exchange modules with more combustion cavities is strong, and when the heat exchange module is used, heat exchange can be performed through any heat exchange module according to different heat exchange requirements. Of course, the fastest heat exchange speed can be achieved by simultaneously working all the heat exchange modules.
In any of the above technical solutions, preferably, the number of fans is the same as the number of air preheaters, and each fan is connected with each air preheater in a one-to-one correspondence.
In the scheme, the number of the fans is the same as that of the air preheaters, and each fan is connected with each air preheater in a one-to-one correspondence manner, so that when a certain heat source group works, air with preset speed can be provided to all combustion cavities in the heat source group only by starting the fan corresponding to the heat source group, the air with the preset speed cannot be conveyed to the heat source group which does not work, and energy conservation is facilitated.
In any of the above solutions, preferably, the method further includes: the flue cavity is internally provided with at least one heat source group, and a third smoke outlet is formed in the flue cavity.
In this scheme, through setting up the flue cavity, install at least one heat source group in the flue cavity to set up the third exhaust port on the flue cavity, make the high temperature flue gas in the burning cavity can flow through the flue cavity, then follow the third exhaust port of flue cavity and discharge to external environment. Through the high temperature flue gas in the flue cavity, can further heat the combustion cavity to have better heat preservation effect, make the temperature on the combustion cavity be difficult for dissipating, improved the heat utilization efficiency.
Optionally, the first exhaust port is disposed at the bottom of the combustion chamber, and/or the third exhaust port is disposed at the top of the flue chamber.
In any of the above solutions, preferably, the method further includes: the heat preservation layer is arranged on the outer surface of the combustion cavity; and/or the igniter is arranged on the combustion cavity and used for igniting the fuel gas in the combustion cavity according to the received control instruction.
In this scheme, through set up the heat preservation at the surface of burning cavity, improved the internal bulk temperature of burning cavity, be favorable to reinforcing radiation heat transfer effect, and then can realize heating the rivers in the second heat transfer water pipe fast. By arranging the ignition device on the combustion cavity, the fuel gas in the combustion cavity can be ignited according to the received control instruction.
Wherein, optionally, the control command is sent to the ignition device through the mobile terminal. The mobile terminal comprises a mobile phone, a remote controller, a computer, a smart watch and the like.
Optionally, the above control command is sent to the ignition device by triggering a control button that is interlocked with the ignition device.
Optionally, the side of the first heat exchange water pipe far away from the inner surface of the combustion cavity is stuck on the radiation plate, and the surface of the radiation plate is black.
Alternatively, the fuel gas includes, but is not limited to, one or a combination of several of natural gas, artificial fuel gas, liquefied petroleum gas, biogas, and coal gas.
The embodiment of the second aspect of the invention provides a gas wall-mounted furnace, which comprises the combustion heat exchange device in any technical scheme.
The wall-mounted gas stove provided by the invention has all the beneficial effects due to the arrangement of the combustion heat exchange device in any one of the technical schemes, and is not repeated here.
An embodiment of a third aspect of the present invention provides a gas water heater, including a combustion heat exchange device in any one of the above technical solutions.
The gas water heater provided by the invention has all the beneficial effects due to the arrangement of the combustion heat exchange device in any one of the technical schemes, and the detailed description is omitted.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.
Drawings
FIG. 1 shows a schematic view of a combustion heat exchange device according to an embodiment of the present invention;
FIG. 2 shows a schematic view of a combustion heat exchange device according to another embodiment of the present invention;
FIG. 3 shows a schematic view of a combustion heat exchange device according to yet another embodiment of the present invention;
FIG. 4 shows a schematic front view of a combustion heat exchange device according to yet another embodiment of the present invention;
FIG. 5 shows a schematic top view of a combustion heat exchange device according to yet another embodiment of the invention;
FIG. 6 shows a schematic bottom view of a combustion heat exchange device according to yet another embodiment of the invention;
fig. 7 shows a schematic left-hand structural view of a combustion heat exchange device according to still another embodiment of the present invention.
The correspondence between the reference numerals and the component names in fig. 1 to 7 is:
102 combustion chamber, 104 air inlet, 106 gas inlet, 108 air preheater, 110 fan, 112 first heat exchange water pipe, 114 second heat exchange water pipe, 116 fume hood, 118 second fume exhaust port, 120 heat exchange fins, 122 fume entrainment region, 124 combustion region, 126 shunt tubes, 128 heat source group.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those described herein, and the scope of the invention is therefore not limited to the specific embodiments disclosed below.
A combustion heat exchange device provided according to some embodiments of the present invention is described below with reference to fig. 1 to 7.
As shown in fig. 1 to 3, the combustion heat exchange device provided by the embodiment of the present invention includes a combustion chamber 102 and an air preheater 108.
Specifically, the combustion chamber 102 is provided with an air inlet 104 and a gas inlet 106 connected to a gas source for supplying gas into the gas chamber. The air preheater 108 has an inlet connected to the outside air and an outlet connected to the air inlet 104, and by providing the air preheater 108, the air entering the air preheater 108 from the inlet can be preheated, and after the air is preheated to a preset temperature, the air preheated to the preset temperature can be discharged into the combustion chamber 102 through the outlet.
Through the scheme, high-temperature air can be input into the combustion cavity 102 from the air inlet 104, so that the combustion reaction is facilitated to be continuously carried out, the combustion heat exchange device has the advantages of being transparent in the combustion cavity 102, free of local high-temperature flame, low in reaction rate, small in local heat release, uniform in heat flow distribution, low in combustion peak temperature and sufficient in combustion, the pollutant generation amount of NOx, CO and the like is extremely low, the noise is extremely low, the overall temperature in the combustion cavity 102 is improved, and the radiation heat exchange is enhanced.
Wherein, alternatively, the preset temperature is greater than or equal to 700 ℃ and less than or equal to 1600 ℃, for example, the preset temperature may be 700 ℃, 900 ℃, 1200 ℃, 1400 ℃, or 1600 ℃. After the air with the preheating temperature enters the combustion cavity 102, the air has a better preheating effect on the fuel gas.
In one embodiment of the present invention, as shown in fig. 1 and 2, the combustion chamber 102 is provided with a first smoke outlet, and the combustion heat exchange device further includes: the smoke hood 116 is buckled on the first smoke outlet, and a second smoke outlet 118 is formed in the smoke hood 116; the first heat exchange water pipe 112 is arranged in the smoke hood 116 and is positioned between the first smoke outlet and the second smoke outlet 118.
In this scheme, burning heat transfer device still includes petticoat pipe 116 and first heat exchange water pipe 112, has seted up first exhaust port on through burning cavity 102, has seted up second exhaust port 118 on the petticoat pipe 116, and first heat exchange water pipe 112 locates in the petticoat pipe 116, and is located between first exhaust port and the second exhaust port 118, can utilize the high temperature flue gas of discharging from burning cavity 102, through the heat transfer of convection mode with the flue gas to first heat exchange water pipe 112 to the realization heats the rivers in the first heat exchange water pipe 112. Through the scheme, the high-temperature flue gas in the combustion cavity 102 can be recycled, so that energy sources are saved, and the heat exchange effect is improved.
In some embodiments of the present invention, as shown in fig. 1 and 2, the combustion heat exchange device further includes: a second heat exchange water pipe 114 disposed on the inner surface of the combustion chamber 102; the combustion heat exchange device is provided with a cold water inlet and a hot water outlet, and the second heat exchange water pipe 114 and the first heat exchange water pipe 112 are connected in series between the cold water inlet and the hot water outlet.
In this scheme, through setting up second heat exchange water pipe 114 on the internal surface of combustion chamber 102, can be with the heat transfer to the second heat exchange water pipe 114 that the heat that produces when the combustion of gas mode is transmitted to, heat exchange efficiency is high. The second heat exchange water pipe 114 and the first heat exchange water pipe 112 are connected in series between the cold water inlet and the hot water outlet, so that water flow entering from the cold water inlet can flow out from the hot water outlet after being heated by the first heat exchange water pipe 112 and the second heat exchange water pipe 114, secondary heat exchange is realized, and the combustion heat exchange device has the advantages of high heating speed and high heating efficiency and can rapidly provide hot water for users.
In some embodiments of the present invention, as shown in fig. 1 and 2, the first smoke outlet is located at the top of the combustion chamber 102, and the air inlet 104 and the gas inlet 106 are both located at the bottom of the combustion chamber 102.
In this scheme, through first exhaust port being located the top of burning cavity 102, air inlet 104 and gas inlet 106 all are located the bottom of burning cavity 102, make gas and high temperature air get into behind the burning cavity 102 and can mix fast on the one hand, have the short and concentrated effect of flame. On the other hand, the flue gas after fully burning in the combustion cavity 102 can be discharged outside the combustion cavity 102 from the first smoke outlet, so that the pressure in the combustion cavity 102 is reduced, the flue gas can be better diluted with air far away from the air inlet 104 side, the gas is fully combusted, and the heat exchange effect is more stable.
In some embodiments of the invention, the first smoke outlet has a smaller caliber than the air inlet 104.
In this scheme, through the bore of first exhaust port being less than the bore of air inlet 104 for the flue gas can circulate in burning cavity 102, is favorable to further diluting the air in the burning cavity 102, makes the gas burn under the low oxygen dilution condition, is favorable to reducing the content of pollutants such as NOx and CO in the flue gas.
In some embodiments of the present invention, as shown in fig. 2, the combustion heat exchange device further includes: the plurality of heat exchange fins 120, all heat exchange fins 120 are sleeved on the first heat exchange water pipe 112, and a space is reserved between every two adjacent heat exchange fins 120.
In this scheme, through suit a plurality of heat transfer fins 120 on first heat transfer water pipe 112 to set up to leave the interval between every two adjacent heat transfer fins 120, further improved the convection heat transfer effect, in the rivers that make in the flue gas heat transfer to first heat transfer water pipe 112 that can be better, with heating to the rivers in the first heat transfer water pipe 112 fast, high-efficient.
In some embodiments of the present invention, as shown in FIG. 3, the caliber of gas inlet 106 is less than the caliber of air inlet 104; and/or the number of the gas inlets 106 is a plurality, the plurality of gas inlets 106 are arranged in sequence along the circumferential direction of the air inlet 104, and a space is reserved between every two adjacent gas inlets 106.
In this scheme, the caliber of the air inlet 104 is larger than that of the gas inlet 106, so that the entrainment effect of air on gas is further improved, and the gas at each gas inlet 106 can be quickly and uniformly mixed with air. The number of the gas inlets 106 is multiple, the multiple gas inlets 106 are sequentially arranged along the circumferential direction of the air inlet 104, and a space is reserved between every two adjacent gas inlets 106, so that the gas and the air at each gas inlet 106 can be quickly and uniformly mixed by utilizing the entrainment effect when the air enters the combustion cavity 102, the reaction rate is improved, and the heat flow distribution is uniform.
In some embodiments of the present invention, as shown in fig. 1 and 2, a combustion heat exchange device includes: the fan 110, the fan 110 includes the wind channel that connects with air preheater 108, and locates the wind wheel in the wind channel, and fan 110 is used for making the air preheated to the air of preset temperature in air preheater 108 enter into the combustion chamber 102 with the speed of predetermineeing from air inlet 104.
In this scheme, the combustion heat exchange device still includes fan 110, and fan 110 includes the wind channel of being connected with air heater 108, and locates the wind wheel in the wind channel, through setting up fan 110, can make the air that preheats to preset temperature in the air heater 108 get into in the burning cavity 102 with the default speed from air inlet 104 to can realize further entrainment flue gas in the burning cavity 102 through the air jet, make the flue gas can be in the inside violent circulation of burning cavity 102, in order to further utilize the flue gas dilution burning cavity 102 that circulates air.
It is noted that the pollutant content such as NOx and CO in the flue gas discharged from the first flue gas outlet is extremely low, and by this combustion heat exchange device, NOx emission can be reduced by seventy percent or more, and thermal efficiency can be improved by thirty percent or more.
In some embodiments of the invention, the preset temperature is greater than or equal to 700 ℃ and less than or equal to 1600 ℃; and/or the preset speed is greater than or equal to 60m/s and less than or equal to 100m/s.
In this embodiment, the predetermined temperature is greater than or equal to 700 ℃ and less than or equal to 1600 ℃, such as 700 ℃, 900 ℃, 1200 ℃, 1400 ℃, or 1600 ℃, to facilitate the combustion reaction in the combustion chamber 102. By having a preset speed of greater than or equal to 60m/s and less than or equal to 90m/s, for example, a preset speed of 60m/s, 75m/s, 80m/s, 85m/s, or 90m/s, when air is injected into the combustion chamber 102 from the air inlet 104, entrainment of the flue gas in the combustion chamber 102 can be achieved, thereby enabling the flue gas to severely circulate in the combustion chamber 102, achieving the effect of diluting the air jet and further preheating the fuel gas.
In some embodiments of the present invention, as shown in fig. 4-7, the number of combustion chambers 102 is a plurality, the plurality of combustion chambers 102 being divided into at least two heat source groups 128, each heat source group 128 comprising at least one combustion chamber 102; the number of air preheaters 108 is the same as the number of heat source groups 128, with the outlet of each air preheater 108 being connected to the air inlets 104 of all combustion chambers 102 in one heat source group 128.
In this solution, the number of the combustion chambers 102 is multiple, the multiple combustion chambers 102 are divided into at least two heat source groups 128, each heat source group 128 includes at least one combustion chamber 102, and the number of the air preheaters 108 is the same as that of the heat source groups 128, and the outlets of each air preheater 108 are simultaneously connected to the air inlets 104 on all the combustion chambers 102 in one heat source group 128, so as to form multiple heat exchange modules connected in parallel (each heat exchange module includes one air preheater 108 and one heat source group 128 correspondingly connected), thereby being capable of performing combined selection on the heat exchange modules according to different load requirements, being beneficial to saving energy consumption and greatly improving the practicability of the combustion heat exchange device.
Wherein, alternatively, the number of combustion chambers 102 in each heat source group 128 may be the same or different, for example, each heat source group 128 may include two combustion chambers 102, or one heat source group 128 may include two combustion chambers 102, and another heat source group 128 may include three combustion chambers 102.
It can be appreciated that the heat exchange capacity of the heat exchange modules with more combustion chambers 102 is strong, and when in use, heat exchange can be performed by any heat exchange module according to different heat exchange requirements. Of course, the fastest heat exchange speed can be achieved by simultaneously working all the heat exchange modules.
In the above embodiment, the outlets of one air preheater 108 and the air inlets 104 of all the combustion chambers 102 in one heat source group 128 are connected by the split pipe 126, and the split pipe 126 has one air inlet connected to the outlet of the air preheater 108 and a plurality of air outlets respectively connected to the air inlets 104.
In some embodiments of the present invention, as shown in fig. 4 to 7, the number of fans 110 is the same as the number of air preheaters 108, and each fan 110 is connected to each air preheater 108 in a one-to-one correspondence.
In this embodiment, the number of fans 110 is the same as that of the air preheaters 108, and each fan 110 is connected with each air preheater 108 in a one-to-one correspondence manner, so that when a certain heat source group 128 works, only the fans 110 corresponding to the heat source group 128 are turned on, and air with a preset speed can be provided to all the combustion cavities 102 in the heat source group 128, so that air with the preset speed cannot be delivered to the heat source group 128 which does not work, thereby being beneficial to saving energy.
In some embodiments of the invention, the combustion heat exchange device further comprises: the flue cavity is internally provided with at least one heat source group 128, and a third smoke outlet is formed in the flue cavity.
In this scheme, through setting up the flue cavity, install at least one heat source group 128 in the flue cavity to set up the third exhaust port on the flue cavity, make the high temperature flue gas in the combustion chamber 102 can flow through the flue cavity, then discharge to the external environment from the third exhaust port of flue cavity. Through the high temperature flue gas in the flue cavity, the combustion cavity 102 can be further heated, and the high temperature flue gas has a better heat preservation effect, so that the temperature on the combustion cavity 102 is not easy to dissipate, and the heat utilization rate is improved.
Optionally, the first exhaust port is disposed at the bottom of the combustion chamber 102 and/or the third exhaust port is disposed at the top of the flue chamber.
In one embodiment of the invention, the high temperature flue gas in the combustion chamber 102 flows through the first and third ports in sequence.
In one embodiment of the invention, the high temperature flue gas in the combustion chamber 102 flows through the first, second and third ports in sequence.
In some embodiments of the invention, a third heat exchange water pipe is disposed between the flue cavity and the combustion cavity 102, the third heat exchange water pipe being connected in series with the first heat exchange water pipe 112 and the second heat exchange water pipe 114 between the cold water inlet and the hot water outlet.
In some embodiments of the present invention, as shown in fig. 4 to 7, the size of each combustion chamber 102 is controlled to be about 10cm in length, width and height, and the single heat load is controlled to be within 1KW, so that the small-sized and compact combustion heat exchange device with high heat exchange effect is realized.
In some embodiments of the invention, the combustion heat exchange device further comprises: the heat preservation layer is arranged on the outer surface of the combustion cavity 102; and/or an igniter, disposed on the combustion chamber 102, for igniting the fuel gas in the combustion chamber 102 according to the received control command.
In this scheme, through set up the heat preservation at the surface of burning cavity 102, improved the bulk temperature in the burning cavity 102, be favorable to reinforcing radiation heat transfer effect, and then can realize heating the rivers in the second heat transfer water pipe 114 fast. By providing an ignition device on the combustion chamber 102, the fuel gas in the combustion chamber 102 can be ignited according to the received control instruction.
Wherein, optionally, the control command is sent to the ignition device through the mobile terminal. The mobile terminal comprises a mobile phone, a remote controller, a computer, a smart watch and the like.
Optionally, the above control command is sent to the ignition device by triggering a control button that is interlocked with the ignition device.
Alternatively, the side of the first heat exchange water pipe 112 away from the inner surface of the combustion chamber 102 is attached to a radiation plate, and the surface of the radiation plate is black.
Alternatively, the fuel gas includes, but is not limited to, one or a combination of several of natural gas, artificial fuel gas, liquefied petroleum gas, biogas, and coal gas.
In one embodiment of the present invention, the combustion heat exchange device includes a combustion chamber 102, an air preheater 108, a fan 110, and a second heat exchange water pipe 114.
Specifically, the combustion chamber 102 is provided with an air inlet 104 and a gas inlet 106 for communicating with a gas source for supplying gas into the gas chamber. The air preheater 108 is communicated with the air inlet 104, the fan 110 is arranged on the air preheater 108, air preheated to more than 700 ℃ in the air preheater 108 is led into the combustion cavity 102 from the air inlet 104 through the fan 110 at a preset speed, and smoke in the combustion cavity 102 is sucked in, so that the smoke can circulate in the combustion cavity 102, and the circulated smoke is utilized to dilute the air in the combustion cavity 102. After the fuel gas, the air and the flue gas are mixed in the combustion chamber 102, they can burn and transfer heat to the second heat exchange water pipe 114 coiled on the combustion chamber 102 in a radiation manner. By the above scheme, the mid (modification & Intense Low Oxygen Dilution) combustion, namely a mild combustion mode under the condition of low oxygen dilution, can be realized, and the combustion reaction can be promoted to be continuously carried out. The combustion heat exchange device has the characteristics of transparent and bright combustion cavity 102, no local high-temperature flame, low reaction rate, little local heat release, uniform heat flow distribution and low combustion peak temperature, and has extremely low pollutant generation amount of NOx, CO and the like and extremely low noise during combustion, and the overall temperature of the combustion cavity 102 is improved, and the radiation heat exchange is enhanced.
It should be noted that, the preset speed is greater than or equal to the jet speed when the air achieves entrainment of the flue gas in the combustion chamber 102.
In particular, the gas and air can mix rapidly after entering the combustion chamber 102, converging into a high concentration reactant stream, with a short and concentrated flame observed after ignition. Further, the air jet with the preset speed can entrain the smoke in the combustion cavity 102, so that the smoke can circulate in the combustion cavity 102, thereby realizing dilution of air and enabling the oxygen concentration in the air to be lower than 5% -10%. The air with the temperature of more than 700 ℃ and the high-temperature smoke gas flowing circularly can preheat the fuel gas, and the temperature of the fuel gas is raised to be more than the ignition point, so that the combustion reaction can be promoted to be continuously carried out. The combustion peak temperature is low, the overall average temperature is raised, the temperature distribution is uniform, the heat exchange of the combustion cavity 102 is enhanced, and the emission of NOx and CO is extremely low.
In another embodiment of the invention, as shown in fig. 1-3, air is pressurized by a blower 110 into an air preheater 108, preheated to above 1000K (i.e., 726.85 degrees celsius), and increased to 400Pa, and injected into the entrainment region 122 through an air nozzle at a rate of 80 m/s. The fuel gas is fed into the fuel gas nozzle (i.e., fuel gas inlet 106) through the fuel gas supply (i.e., fuel gas source), and the fuel gas momentum at the fuel gas nozzle is small and is entrained into the air through the air. And mixing with the entrained flue gas. After mixing is complete, the mixture enters the mid combustion zone 124. The combustion of the gas with air and exhaust gas mixture occurs in a mid combustion zone 124, which emits infrared radiation. Radiant heat is transferred to the water stream through the blackbody radiation heat exchanger (i.e., the second heat exchange water tube 114). The flue gas after combustion and radiation heat exchange is subjected to secondary heat exchange with water flow through a convection heat exchanger (namely a first heat exchange water pipe 112), and finally flows into the atmosphere.
Optionally, a radiation plate is disposed on a side of the first heat exchange water pipe 112 away from the inner surface of the combustion chamber 102, and the surface of the radiation plate is black.
The embodiment of the invention provides a gas wall-mounted furnace (not shown), which comprises the combustion heat exchange device in any embodiment.
The gas wall-mounted furnace (not shown) provided by the invention has all the beneficial effects due to the arrangement of the combustion heat exchange device in any embodiment, and is not repeated here.
The embodiment of the invention provides a gas water heater (not shown) comprising the combustion heat exchange device in any embodiment.
The gas water heater (not shown) provided by the invention has all the beneficial effects due to the arrangement of the combustion heat exchange device in any one of the embodiments, and is not repeated here.
In summary, the combustion heat exchange device, the gas wall-mounted furnace and the gas water heater provided by the invention have the characteristics of transparent combustion cavity, no local high-temperature flame, low reaction rate, less local heat release, uniform heat flow distribution and low combustion peak temperature, and have extremely low pollutant generation amount of NOx, CO and the like, extremely low noise during combustion, and the overall temperature in the combustion cavity is improved, and the radiation heat exchange is enhanced.
In the present invention, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more, unless expressly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or units referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention.
In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (13)

1. A combustion heat exchange device, comprising:
the combustion chamber is provided with an air inlet and a gas inlet, and the gas inlet is connected to a gas source;
an air preheater having an inlet connected to external air and an outlet connected to the air inlet for preheating air entering from the inlet and discharging the preheated air into the combustion chamber through the outlet after the air is preheated to a preset temperature;
the combustion chamber is last to have offered first exhaust port, combustion heat transfer device still includes:
the smoke hood is buckled on the first smoke outlet, and a second smoke outlet is formed in the smoke hood;
the first heat exchange water pipe is arranged in the smoke hood and is positioned between the first smoke outlet and the second smoke outlet;
the second heat exchange water pipe is arranged on the inner surface of the combustion cavity;
the combustion heat exchange device is provided with a cold water inlet and a hot water outlet, and the second heat exchange water pipe and the first heat exchange water pipe are connected in series between the cold water inlet and the hot water outlet.
2. A combustion heat exchange apparatus according to claim 1, wherein,
the first smoke outlet is positioned at the top of the combustion cavity, and the air inlet and the gas inlet are both positioned at the bottom of the combustion cavity.
3. A combustion heat exchange apparatus according to claim 1, wherein,
the caliber of the first smoke outlet is smaller than that of the air inlet.
4. The combustion heat exchange apparatus as set forth in claim 1, further comprising:
the heat exchange fins are sleeved on the first heat exchange water pipe, and a space is reserved between every two adjacent heat exchange fins.
5. A combustion heat exchange apparatus according to any one of claims 1 to 4,
the caliber of the gas inlet is smaller than that of the air inlet; and/or
The number of the gas inlets is multiple, the multiple gas inlets are sequentially arranged along the circumferential direction of the air inlet, and a space is reserved between every two adjacent gas inlets.
6. The combustion heat exchange device according to any one of claims 1 to 4, further comprising:
the fan comprises an air duct connected with the air preheater and a wind wheel arranged in the air duct, and the fan is used for enabling air preheated to the preset temperature in the air preheater to enter the combustion cavity from the air inlet at a preset speed.
7. The combustion heat exchange apparatus as set forth in claim 6, wherein,
the preset temperature is greater than or equal to 700 ℃ and less than or equal to 1600 ℃; and/or
The preset speed is greater than or equal to 60m/s and less than or equal to 100m/s.
8. The combustion heat exchange apparatus as set forth in claim 6, wherein,
the number of the combustion cavities is multiple, the combustion cavities are divided into at least two heat source groups, and each heat source group comprises at least one combustion cavity;
the number of air preheaters is the same as the number of heat source groups, the outlet of each air preheater being connected to the air inlets of all the combustion chambers in one heat source group.
9. The combustion heat exchange apparatus as set forth in claim 8, wherein,
the number of the fans is the same as that of the air preheaters, and each fan is connected with each air preheater in a one-to-one correspondence manner.
10. The combustion heat exchange device according to claim 8 or 9, further comprising:
the flue cavity is internally provided with at least one heat source group, and a third smoke outlet is formed in the flue cavity.
11. The combustion heat exchange device according to any one of claims 1 to 4, further comprising:
the heat preservation layer is arranged on the outer surface of the combustion cavity; and/or
The igniter is arranged on the combustion cavity and used for igniting the fuel gas in the combustion cavity according to the received control instruction.
12. A gas wall-hanging stove, characterized by comprising:
a combustion heat exchange device according to any one of claims 1 to 11.
13. A gas water heater, comprising:
a combustion heat exchange device according to any one of claims 1 to 11.
CN201810916243.8A 2018-08-13 2018-08-13 Combustion heat exchange device, gas wall-mounted furnace and gas water heater Active CN108954799B (en)

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