CN108662606B - Water heating system based on multistage combustion - Google Patents
Water heating system based on multistage combustion Download PDFInfo
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- CN108662606B CN108662606B CN201810418060.3A CN201810418060A CN108662606B CN 108662606 B CN108662606 B CN 108662606B CN 201810418060 A CN201810418060 A CN 201810418060A CN 108662606 B CN108662606 B CN 108662606B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K5/00—Feeding or distributing other fuel to combustion apparatus
- F23K5/002—Gaseous fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
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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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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
The invention discloses a water heating system based on multi-stage combustion, which comprises water heating equipment, a cold water inlet pipe and a hot water outlet pipe, wherein the cold water inlet pipe is connected with the hot water outlet pipe; the water outlet end of the cold water inlet pipe is communicated and connected with the cold water inlet end of the water heating equipment; the hot water outlet end of the water heating equipment is communicated and connected with the hot water outlet pipe; adopt two air preheating devices, the flue gas waste heat after the make full use of burning fully preheats the combustion air that will enter into the burner the inside, effectively improves the holistic thermal utilization ratio of equipment.
Description
Technical Field
The invention belongs to the field of water heating, and particularly relates to a water heating system based on multi-stage combustion.
Background
In the boiler, the combustion efficiency can be further improved after the ethanol steam and the combustion-supporting air are highly mixed, but the mixed environment of the ethanol steam and the combustion-supporting air in the cavity is difficult to control, the phenomenon of combustion and explosion can be easily caused when the ethanol steam and the combustion-supporting air are not well mixed, and the combustion process is uncontrollable.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides a water heating system based on multi-stage combustion, which improves the combustion efficiency.
The technical scheme is as follows: in order to achieve the aim, the invention discloses a water heating system based on multi-stage combustion, which comprises water heating equipment, a cold water inlet pipe and a hot water outlet pipe; the water outlet end of the cold water inlet pipe is communicated and connected with the cold water inlet end of the water heating equipment; the hot water outlet end of the water heating equipment is communicated and connected with the hot water outlet pipe;
the water heating equipment is provided with two smoke exhaust ends, wherein the first smoke exhaust end is communicated and connected with a first smoke exhaust pipe, and the second smoke exhaust end is communicated and connected with a second smoke exhaust pipe; the second hot air pipe and the second combustion air supply pipe are also included; the air outlet ends of the second hot air pipe and the second combustion air supply pipe are respectively communicated with the cold air inlet ends of the first air preheater and the second air preheater; the hot air outlet ends of the first air preheater and the second air preheater are respectively communicated with a first hot air pipe and a second hot air pipe; the air outlet ends of the first hot air pipe and the second hot air pipe are respectively communicated and connected with a first combustion air inlet end and a second combustion air inlet end of the water heating equipment;
the water heating device also comprises a natural gas supply pipe and an ethanol liquid supply pipe, wherein the gas outlet end of the natural gas supply pipe is communicated with the natural gas inlet end of the water heating device; the liquid outlet end of the ethanol liquid supply pipe is communicated with the ethanol liquid inlet end of the water heating equipment;
the gas outlet end of the first smoke exhaust pipe is connected with the hot smoke inlet end of the second air preheater, and the smoke exhaust end of the second air preheater is communicated and connected with a first tail gas pipe; the air outlet end of the second smoke exhaust pipe is communicated and connected with the hot smoke inlet end of the first air preheater, and the smoke exhaust end of the first air preheater is communicated and connected with the second tail gas pipe.
Further, the first air preheater is of a horizontal closed box structure; a first preheating cavity is arranged in the first air preheater; a first branch box and a first collecting box are respectively arranged at two ends of the first preheating cavity; the inner cavity of the first flow distribution box is communicated and connected with the air outlet end of the second hot air pipe; the inner cavity of the first collecting box is communicated and connected with the air inlet end of the first hot air pipe;
a plurality of first preheating smoke pipes are transversely arranged in parallel in the first preheating cavity, and the air inlet end of each first preheating smoke pipe is communicated and connected with the first branch box; the air outlet end of each first preheating smoke pipe is communicated and connected with a first collecting box; the air outlet end of the second smoke exhaust pipe is communicated with the first preheating cavity, and the air outlet communication position of the second smoke exhaust pipe is positioned at one end, close to the first collecting box, of the first preheating cavity; and the air inlet end of the second tail gas pipe is communicated with one end of the first preheating cavity close to the first flow dividing box.
Further, the second air preheater is of a longitudinal closed box structure; a second preheating cavity is arranged in the second air preheater; a second branch box is arranged at the upper end of the second preheating cavity, and a second collecting box is arranged below the second preheating cavity; the inner cavity of the second distribution box is communicated and connected with the air outlet end of the second combustion air supply pipe; the inner cavity of the second collecting box is communicated and connected with the air inlet end of the second hot air pipe;
a plurality of second preheating smoke pipes are vertically arranged in the second preheating cavity in a bundle shape, and the upper ends of the second preheating smoke pipes are communicated and connected with the second branch box; the lower end of each second preheating smoke pipe is communicated and connected with the inner cavity of the second collecting box;
the air outlet end of the first exhaust pipe is communicated and connected with the upper end of the second preheating cavity, and the air inlet end of the first tail gas pipe is communicated and connected with the lower end of the second preheating cavity.
Further, the water heating equipment comprises an ethanol steam generation furnace body and a combustion heating furnace body; the ethanol steam generating furnace body is of a cylindrical shell structure with a vertical posture; the combustion heating furnace body is of a top-down shell structure; the upper end of the ethanol steam generation furnace body is integrally communicated and connected with the lower end of the combustion heating furnace body; a natural gas heating furnace core is coaxially arranged in an inner cavity of the ethanol steam generation furnace body, the natural gas heating furnace core is of a heat-conducting metal cylindrical shell structure, a cylindrical combustion chamber is coaxially arranged in the natural gas heating furnace core, an annular cylindrical ethanol steam generation cavity is formed between the outer wall of the natural gas heating furnace core and the inner wall of the ethanol steam generation furnace body, a liquid outlet end of the ethanol liquid supply pipe extends into the ethanol steam generation cavity, a natural gas flame jet orifice is arranged at the lower end of the cylindrical combustion chamber, and the flame jet direction of the natural gas flame jet orifice is upward along the axis of the cylindrical combustion chamber; the upper end of the cylindrical combustion chamber is a flue gas discharge end; a plurality of ring discs are coaxially arranged in the ethanol steam generation cavity, and the ring discs are of metal annular thin-wall structures; the ring disks are arranged at equal intervals from top to bottom, the inner ring of each ring disk is integrally connected with the outer wall of the natural gas heating furnace core, and the outer ring of each ring disk is integrally connected with the inner wall of the ethanol steam generation furnace body; the disc surface of each annular disc is hollowed with a plurality of bubble through holes which are uniformly distributed on the disc surface of each annular disc;
the lower end of the ethanol steam generation cavity is provided with an annular chassis, the lower side of the annular chassis is provided with a combustion air transition cavity, the annular chassis is hollowed with a plurality of bubbling air holes, and the bubbling air holes are uniformly distributed on the annular chassis;
and the air outlet end of the second hot air pipe is communicated and connected with the combustion air transition cavity.
Further, a burner is further installed at the lower end of the ethanol steam generation furnace body, and a natural gas flame jet orifice of the burner extends into the cylindrical combustion chamber; the gas outlet end of the natural gas supply pipe is communicated and connected with the natural gas inlet end of the combustor, and the gas outlet end of the first hot air pipe is communicated and connected with the combustion air inlet end of the combustor.
Further, the inner cavity of the combustion heating furnace body is also coaxially wrapped with a water heating furnace core, the water heating furnace core is of a gyro-shaped closed metal shell structure, and a water heating cavity is arranged in the heating furnace core; a combustion annular cavity is formed between the outer wall of the water heating furnace core and the inner wall of the combustion heating furnace body; the lower end of the combustion ring cavity is communicated with the upper end of the ethanol steam generation cavity; the lower part of the combustion annular cavity is a conical combustion annular cavity in a horn opening shape, and the upper part of the combustion annular cavity is a cylindrical combustion annular cavity; the cylindrical combustion ring cavity is spirally provided with a heat exchange water pipe; the top of the cylindrical combustion ring cavity is communicated with a first smoke exhaust pipe;
the device also comprises a filter and a transition water pipe; the water outlet end of the cold water inlet pipe is communicated and connected with the water inlet end at the upper end of the heat exchange water pipe, the water outlet end at the lower end of the heat exchange water pipe is communicated and connected with the water inlet end of the filter, the water outlet end of the filter is communicated and connected with the water inlet end of the transition water pipe, and the water outlet end of the transition water pipe is communicated and connected with the upper end of the water heating cavity; the water inlet end of the hot water outlet pipe extends into the bottom of the water heating cavity;
the middle part of each hard heat exchange smoke tube vertically penetrates through the water heating cavity, and the lower end of each hard heat exchange smoke tube is communicated with a smoke discharge end at the upper end of the cylindrical combustion chamber; the upper end of each hard heat exchange smoke pipe is connected with a second smoke exhaust pipe.
Has the advantages that: the invention has simple structure, adopts two air preheating devices, fully utilizes the waste heat of the combusted flue gas to fully preheat the combustion-supporting air which is about to enter the combustion device, effectively improves the utilization rate of the heat of the whole equipment, simultaneously adopts an ethanol steam generation cavity structure to ensure that the gas continuously emitted from bubbles in the combustion annular cavity is the gas which is highly and uniformly mixed with the combustion-supporting air and the ethanol steam, and further the combustion annular cavity generates uniform combustion flame, and the liquid level at the upper end of the ethanol steam generation cavity is continuously supplemented with the mixed gas with broken bubbles, so that the combustion annular cavity generates a continuous and efficient combustion state, and further the flame in the combustion annular cavity simultaneously heats the water heating furnace core and the heat exchange water pipe.
Drawings
FIG. 1 is a first view of the overall structure of the present invention;
FIG. 2 is a second view of the overall structure of the present invention;
FIG. 3 is a schematic view of the internal structure of the first air preheater;
FIG. 4 is a schematic diagram of the internal structure of a second air preheater;
FIG. 5 is a schematic view of the interior of the water heating apparatus;
FIG. 6 is a schematic diagram of the internal structure of the ethanol vapor generation chamber.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
A water heating system based on multi-stage combustion as shown in fig. 1 to 6 includes a water heating apparatus 60, a cold water inlet pipe 26 and a hot water outlet pipe 24; the water outlet end of the cold water inlet pipe 26 is communicated and connected with the cold water inlet end of the water heating equipment 60; the hot water outlet end of the water heating device 60 is communicated and connected with the hot water outlet pipe 24;
the water heating device 60 is provided with two smoke exhaust ends, wherein the first smoke exhaust end is communicated and connected with the first smoke exhaust pipe 25, and the second smoke exhaust end is communicated and connected with the second smoke exhaust pipe 19; a second hot air pipe 53 and a second combustion air supply pipe 44; the outlet ends of the second hot air pipe 53 and the second combustion air supply pipe 44 are respectively communicated with the cold air inlet ends of the first air preheater 52 and the second air preheater 42; the hot air outlet ends of the first air preheater 52 and the second air preheater 42 are respectively communicated with the first hot air pipe 4 and the second hot air pipe 5; the air outlet ends of the first hot air pipe 4 and the second hot air pipe 5 are respectively communicated and connected with a first combustion air inlet end and a second combustion air inlet end of the water heating device 60;
the water heating device further comprises a natural gas supply pipe 1 and an ethanol liquid supply pipe 61, wherein the gas outlet end of the natural gas supply pipe 1 is communicated with the gas inlet end of the natural gas of the water heating device 60; the liquid outlet end of the ethanol liquid supply pipe 61 is communicated with the ethanol liquid inlet end of the water heating device 60;
the air outlet end of the first smoke exhaust pipe 25 is connected with the hot smoke inlet end of the second air preheater 42, and the smoke exhaust end of the second air preheater 42 is communicated with a first tail gas pipe 47; the air outlet end of the second smoke exhaust pipe 19 is communicated and connected with the hot smoke inlet end of the first air preheater 52, and the smoke exhaust end of the first air preheater 52 is communicated and connected with the second tail gas pipe 54.
The first air preheater 52 is a horizontal closed box structure; inside the first air preheater 52 is a first preheating chamber 49; a first branch tank 55 and a first collecting tank 50 are respectively arranged at two ends of the first preheating cavity 49; the inner cavity of the first flow dividing box 55 is communicated and connected with the air outlet end of the second hot air pipe 53; the inner cavity of the first collecting tank 50 is communicated and connected with the air inlet end of the first hot air pipe 4;
a plurality of first preheating smoke pipes 51 are transversely arranged in parallel in the first preheating cavity 49, and the air inlet end of each first preheating smoke pipe 51 is communicated and connected with the first flow dividing box 55; the air outlet end of each first preheating smoke pipe 51 is communicated and connected with a first collecting box 50; the air outlet end of the second smoke exhaust pipe 19 is communicated with the first preheating cavity 49, and the air outlet communication position of the second smoke exhaust pipe 19 is positioned at one end of the first preheating cavity 49 close to the first collecting box 50; the air inlet end of the second tail gas pipe 54 is communicated with one end of the first preheating cavity 49 close to the first flow dividing box 55; the first air preheater 52 preheats the air entering the second hot air pipe 53 by using the high-temperature flue gas generated by the natural gas, and the waste heat of the flue gas is fully utilized;
the second air preheater 42 is a longitudinal closed box structure; a second preheating cavity 45 is arranged inside the second air preheater 42; a second branch box 41 is arranged at the upper end of the second preheating cavity 45, and a second collecting box 46 is arranged below the second preheating cavity 45; the inner cavity of the second flow dividing box 41 is communicated with the air outlet end of the second combustion air supply pipe 44; the inner cavity of the second collecting tank 46 is communicated and connected with the air inlet end of the second hot air pipe 5; the above-mentioned
A plurality of second preheating smoke pipes 43 are also vertically arranged in the second preheating cavity 45 in a bundle shape, and the upper ends of the second preheating smoke pipes 43 are communicated and connected with the second flow dividing box 41; the lower end of each second preheating smoke pipe 43 is communicated with the inner cavity of the second collecting box 46; the second air preheater 42 preheats the combustion air from the second combustion air supply pipe 44 by using the heat of the high-temperature flue gas discharged from the combustion ring cavity 30, thereby fully utilizing the waste heat of the flue gas;
the air outlet end of the first exhaust pipe 25 is communicated and connected with the upper end of the second preheating cavity 45, and the air inlet end of the first tail gas pipe 47 is communicated and connected with the lower end of the second preheating cavity 45.
The water heating device 60 comprises an ethanol steam generation furnace body 15 and a combustion heating furnace body 23; the ethanol steam generation furnace body 15 is a cylindrical shell structure with a vertical posture; the combustion heating furnace body 23 is of a top-down shell structure; the upper end of the ethanol steam generation furnace body 15 is integrally communicated and connected with the lower end of the combustion heating furnace body 23; a natural gas heating furnace core 22 is coaxially arranged in the inner cavity of the ethanol steam generation furnace body 15, the natural gas heating furnace core 22 is of a heat-conducting metal cylindrical shell structure, a cylindrical combustion chamber 7 is coaxially arranged inside the natural gas heating furnace core 22, a cylindrical ethanol steam generation cavity 10 is formed between the outer wall of the natural gas heating furnace core 22 and the inner wall of the ethanol steam generation furnace body 15, the liquid outlet end of an ethanol liquid supply pipe 61 extends into the ethanol steam generation cavity 10, a natural gas flame jet orifice 3 is arranged at the lower end of the cylindrical combustion chamber 7, and the flame jet direction of the natural gas flame jet orifice 3 is upward along the axis of the cylindrical combustion chamber 7; the upper end of the cylindrical combustion chamber 7 is a flue gas discharge end; a plurality of ring disks 14 are coaxially arranged in the ethanol steam generation cavity 10, and the ring disks 14 are of metal annular thin-wall structures; the ring disks 14 are arranged at equal intervals from top to bottom, the inner ring of each ring disk 14 is integrally connected with the outer wall of the natural gas heating furnace core 22, and the outer ring of each ring disk 14 is integrally connected with the inner wall of the ethanol steam generation furnace body 15; the disc surface of each annular disc 14 is provided with a plurality of bubble through holes 13 in a hollow manner, and the plurality of bubble through holes 13 are uniformly distributed on the disc surface of each annular disc 14;
the lower end of the ethanol steam generation cavity 10 is provided with an annular chassis 6, the lower side of the annular chassis 6 is provided with a combustion air transition cavity 11, the annular chassis 6 is hollowed with a plurality of bubbling air holes 12, and the bubbling air holes 12 are uniformly distributed on the annular chassis 6;
the air outlet end of the second hot air pipe 5 is communicated with the combustion air transition cavity 11.
The lower end of the ethanol steam generation furnace body 15 is also provided with a burner 2, and a natural gas flame jet orifice 3 of the burner 2 extends into the cylindrical combustion chamber 7; the gas outlet end of the natural gas supply pipe 1 is communicated and connected with the natural gas inlet end of the combustor 2, and the gas outlet end of the first hot air pipe 4 is communicated and connected with the combustion air inlet end of the combustor 2.
The inner cavity of the combustion heating furnace body 23 is also coaxially wrapped with a water heating furnace core 31, the water heating furnace core 31 is of a gyro-shaped closed metal shell structure, and a water heating cavity 34 is formed inside the heating furnace core 31; a combustion annular cavity 30 is formed between the outer wall of the water heating furnace core 31 and the inner wall of the combustion heating furnace body 23; the lower end of the combustion ring cavity 30 is communicated with the upper end of the ethanol steam generation cavity 10; the lower part of the combustion annular cavity 30 is a conical combustion annular cavity 21.1 in a horn opening shape, and the upper part of the combustion annular cavity 30 is a cylindrical combustion annular cavity 21.2; a heat exchange water pipe 33 is spirally and spirally arranged in the cylindrical combustion ring cavity 21.2; the top of the cylindrical combustion ring cavity 21.2 is communicated with a first smoke exhaust pipe 25;
also comprises a filter 29 and a transition water pipe 28; the water outlet end of the cold water inlet pipe 26 is communicated and connected with the water inlet end at the upper end of the heat exchange water pipe 33, the water outlet end at the lower end of the heat exchange water pipe 33 is communicated with the water inlet end of the filter 29, the water outlet end of the filter 29 is communicated with the water inlet end of the transition water pipe 28, and the water outlet end of the transition water pipe 28 is communicated with the upper end of the water heating cavity 34; the water inlet end of the hot water outlet pipe 24 extends into the bottom of the water heating cavity 34;
the device also comprises a plurality of hard heat exchange smoke pipes 17 distributed in a bundle shape, the middle part of each hard heat exchange smoke pipe 17 vertically penetrates through the water heating cavity 34, and the lower end of each hard heat exchange smoke pipe 17 is communicated with a smoke discharge end at the upper end of the cylindrical combustion chamber 7; the upper end of each hard heat exchange smoke pipe 17 is connected with a second smoke exhaust pipe 19.
The method, the process and the technical progress of the scheme are organized as follows:
a preparation link: before starting, the ethanol supply device fills liquid ethanol into the ethanol steam generation cavity 10 until the height of the ethanol liquid level in the whole ethanol steam generation cavity 10 is higher than the height of the uppermost layer of the ring disc 14, and because the ethanol in the ethanol steam generation cavity 10 is always consumed in the running process of the equipment, the ethanol supply device is controlled to always maintain the height of the ethanol liquid level in the ethanol steam generation cavity 10 unchanged in the running process of the whole equipment; meanwhile, the water heating cavity 34 is ensured to be in a full water filling state in the initial state;
a combustion heating link: the natural gas supply pipe 1 and the second combustion-supporting air pipe 4 respectively and continuously supply natural gas and combustion-supporting air to the combustor 2, at the moment, an electronic ignition device in the natural gas heating furnace core 22 is started, then the natural gas flame jet orifice 3 generates upward-jetted flame, and then the jetted flame heats the inner wall of the natural gas heating furnace core 22; along with the lapse of time, the temperature in the ethanol steam generation cavity 10 reaches the boiling point, and then the ethanol in the ethanol steam generation cavity 10 begins to boil, adjust the flame jet intensity of the natural gas flame jet orifice 3, and then make the ethanol liquid in the ethanol steam generation cavity 10 in the low intensity boiling state, the ethanol in the ethanol steam generation cavity 10 continuously generates uniform ethanol boiling bubbles in the whole ethanol steam generation cavity 10 during the boiling process, and then the ethanol boiling bubbles continuously roll in the ethanol steam generation cavity 10, and the whole ethanol boiling bubble group is in the upward floating trend; because each ring disc 14 divides the ethanol steam generation cavity 10 into a plurality of relatively independent liquid boiling cavities, each liquid boiling cavity can generate a relatively independent boiling rolling phenomenon, each ring disc 14 avoids the overall boiling rolling phenomenon of the ethanol steam generation cavity 10, and meanwhile, the ring discs 14 are matched with the bubble through holes 13 uniformly distributed on the ring discs 14 to delay the floating trend of bubbles, so that the bubbles can be more durably rolled in the ethanol steam generation cavity 10, the fusion and mixing of two kinds of bubbles in the ethanol steam generation cavity 10 are promoted, and the stability of the ethanol steam generation cavity 10 in the boiling process is improved; meanwhile, the second hot air pipe 5 continuously injects excessive combustion-supporting air into the combustion-supporting air transition cavity 11, at the moment, compressed combustion-supporting air in the combustion-supporting air transition cavity 11 is continuously injected into the bottom of the ethanol steam generation cavity 10 in the form of fine bubbles through each bubbling air hole 12 on the annular base plate 6, and then combustion-supporting bubble groups continuously float upwards in the ethanol steam generation cavity 10 under the action of buoyancy force, and as the ethanol steam generation cavity 10 is already in a boiling state, the combustion-supporting bubbles perform boiling type rolling motion along with the boiling liquid ethanol in the floating process; then the ethanol steam bubbles and the combustion air bubbles in the ethanol steam generating cavity 10 are mixed under the action of the rolling ethanol liquid to form a large amount of mixed bubbles of ethanol and combustion air which are highly mixed; because the bubbles mixed by the combustion air and the ethanol steam are also positioned in the boiling liquid in the ethanol steam generation cavity 10, the ignition point can not be reached, but the combustion air and the ethanol steam can be promoted to be highly mixed by virtue of the disturbance and the rolling effect of boiling, so that the bubbles mixed by the combustion air and the ethanol steam can not generate the phenomenon of deflagration; the bubbles mixed by the combustion air and the ethanol steam finally float to the liquid level at the upper end of the ethanol steam generation cavity 10 and generate bubble breakage, and then a large amount of mixed gas of the combustion air and the ethanol steam continuously enters the combustion annular cavity 30; meanwhile, the electronic ignition device in the combustion annular cavity 30 is started, because the gas in the combustion annular cavity 30 is the gas highly and uniformly mixed with the combustion air and the ethanol steam, the combustion annular cavity 30 generates uniform combustion flame, and because the liquid level at the upper end of the ethanol steam generation cavity 10 is continuously supplemented with the mixed gas with broken bubbles, the combustion annular cavity 30 generates a continuous and efficient combustion state, and the flame in the combustion annular cavity 30 simultaneously heats the water heating furnace core 31 and the heat exchange water pipe 33; the flue gas generated in the final burning ring cavity 30 enters the first smoke exhaust pipe 40; meanwhile, the high-temperature flue gas generated in the combustion chamber 7 of the natural gas heating furnace core 22 is discharged into the second smoke discharge pipe 19 through the hard heat exchange smoke pipes 17 distributed in a bundle shape, and the hard heat exchange smoke pipes 17 distributed in the bundle shape continuously heat the water in the water heating cavity 34.
Water heating path: the cold water inlet pipe 26 leads cold water into the heat exchange water pipe 33, then the water in the heat exchange water pipe 33 is heated and then led into the water heating cavity 34 through the transition water pipe 28, and then the water in the water heating cavity 34 is subjected to double secondary heating of the heat exchange smoke pipe 17 and the combustion annular cavity 30 and finally discharged through the hot water outlet pipe 24; thereby realizing multiple heating.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (6)
1. A water heating system based on multistage burning, its characterized in that: comprises a water heating device (60), a cold water inlet pipe (26) and a hot water outlet pipe (24); the water outlet end of the cold water inlet pipe (26) is communicated and connected with the cold water inlet end of the water heating equipment (60); the hot water outlet end of the water heating equipment (60) is communicated and connected with the hot water outlet pipe (24);
the water heating equipment (60) is provided with two smoke exhaust ends, wherein the first smoke exhaust end is communicated and connected with the first smoke exhaust pipe (25), and the second smoke exhaust end is communicated and connected with the second smoke exhaust pipe (19); a second hot air pipe (53) and a second combustion air supply pipe (44); the air outlet ends of the second hot air pipe (53) and the second combustion air supply pipe (44) are respectively communicated with the cold air inlet ends of the first air preheater (52) and the second air preheater (42); the hot air outlet ends of the first air preheater (52) and the second air preheater (42) are respectively communicated with a first hot air pipe (4) and a second hot air pipe (5); the air outlet ends of the first hot air pipe (4) and the second hot air pipe (5) are respectively communicated and connected with a first combustion air inlet end and a second combustion air inlet end of the water heating equipment (60);
the natural gas heating device also comprises a natural gas supply pipe (1) and an ethanol liquid supply pipe (61), wherein the gas outlet end of the natural gas supply pipe (1) is communicated with the gas inlet end of the natural gas of the water heating device (60); the liquid outlet end of the ethanol liquid supply pipe (61) is communicated with the ethanol liquid inlet end of the water heating equipment (60);
the air outlet end of the first smoke exhaust pipe (25) is connected with the hot smoke inlet end of the second air preheater (42), and the smoke exhaust end of the second air preheater (42) is communicated with a first tail gas pipe (47); the air outlet end of the second smoke exhaust pipe (19) is communicated and connected with the hot smoke inlet end of the first air preheater (52), and the smoke exhaust end of the first air preheater (52) is communicated and connected with a second tail gas pipe (54).
2. The multi-stage combustion based water heating system of claim 1, wherein: the first air preheater (52) is of a horizontal closed box structure; the first air preheater (52) is internally provided with a first preheating cavity (49); a first branch box (55) and a first collecting box (50) are respectively arranged at two ends of the first preheating cavity (49); the inner cavity of the first flow dividing box (55) is communicated and connected with the air outlet end of the second hot air pipe (53); the inner cavity of the first collecting box (50) is communicated and connected with the air inlet end of the first hot air pipe (4);
a plurality of first preheating smoke pipes (51) are transversely arranged in parallel in the first preheating cavity (49), and the air inlet end of each first preheating smoke pipe (51) is communicated and connected with the first branch box (55); the air outlet end of each first preheating smoke pipe (51) is communicated and connected with a first collecting box (50); the air outlet end of the second smoke exhaust pipe (19) is communicated with the first preheating cavity (49), and the air outlet communication position of the second smoke exhaust pipe (19) is positioned at one end, close to the first collecting box (50), of the first preheating cavity (49); the air inlet end of the second tail gas pipe (54) is communicated with one end of the first preheating cavity (49) close to the first branch box (55).
3. The multi-stage combustion based water heating system of claim 1, wherein: the second air preheater (42) is of a longitudinal closed box structure; a second preheating cavity (45) is arranged inside the second air preheater (42); a second branch box (41) is arranged at the upper end of the second preheating cavity (45), and a second collecting box (46) is arranged below the second preheating cavity (45); the inner cavity of the second flow dividing box (41) is communicated and connected with the air outlet end of the second combustion air supply pipe (44); the inner cavity of the second collecting box (46) is communicated and connected with the air inlet end of the second hot air pipe (5);
a plurality of second preheating smoke pipes (43) are also vertically arranged in the second preheating cavity (45) in a bundle shape, and the upper end of each second preheating smoke pipe (43) is communicated and connected with the second branch box (41); the lower end of each second preheating smoke pipe (43) is communicated and connected with the inner cavity of the second collecting box (46);
the air outlet end of the first exhaust pipe (25) is communicated and connected with the upper end of the second preheating cavity (45), and the air inlet end of the first tail gas pipe (47) is communicated and connected with the lower end of the second preheating cavity (45).
4. The multi-stage combustion based water heating system of claim 1, wherein: the water heating equipment (60) comprises an ethanol steam generation furnace body (15) and a combustion heating furnace body (23); the ethanol steam generating furnace body (15) is of a cylindrical shell structure with a vertical posture; the combustion heating furnace body (23) is of a top-down shell structure; the upper end of the ethanol steam generation furnace body (15) is integrally communicated and connected with the lower end of the combustion heating furnace body (23); a natural gas heating furnace core (22) is coaxially arranged in an inner cavity of the ethanol steam generation furnace body (15), the natural gas heating furnace core (22) is of a heat-conducting metal cylindrical shell structure, a cylindrical combustion chamber (7) is coaxially arranged in the natural gas heating furnace core (22), an annular cylindrical ethanol steam generation cavity (10) is formed between the outer wall of the natural gas heating furnace core (22) and the inner wall of the ethanol steam generation furnace body (15), a liquid outlet end of an ethanol liquid supply pipe (61) extends into the ethanol steam generation cavity (10), a natural gas flame jet orifice (3) is arranged at the lower end of the cylindrical combustion chamber (7), and the flame jet direction of the natural gas flame jet orifice (3) is upward along the axis of the cylindrical combustion chamber (7); the upper end of the cylindrical combustion chamber (7) is a flue gas discharge end; a plurality of ring discs (14) are coaxially arranged in the ethanol steam generation cavity (10), and the ring discs (14) are of metal annular thin-wall structures; the ring disks (14) are arranged at equal intervals from top to bottom, the inner ring of each ring disk (14) is integrally connected with the outer wall of the natural gas heating furnace core (22), and the outer ring of each ring disk (14) is integrally connected with the inner wall of the ethanol steam generation furnace body (15); the disc surface of each annular disc (14) is provided with a plurality of bubble through holes (13) in a hollow manner, and the plurality of bubble through holes (13) are uniformly distributed on the disc surface of each annular disc (14);
an annular chassis (6) is arranged at the lower end of the ethanol steam generation cavity (10), a combustion air transition cavity (11) is arranged at the lower side of the annular chassis (6), a plurality of bubbling air holes (12) are hollowed out on the annular chassis (6), and the bubbling air holes (12) are uniformly distributed on the annular chassis (6);
the air outlet end of the second hot air pipe (5) is communicated and connected with the combustion air transition cavity (11).
5. The multi-stage combustion based water heating system of claim 4, wherein: the lower end of the ethanol steam generation furnace body (15) is also provided with a burner (2), and a natural gas flame jet orifice (3) of the burner (2) extends into the cylindrical combustion chamber (7); the gas outlet end of the natural gas supply pipe (1) is communicated and connected with the natural gas inlet end of the combustor (2), and the gas outlet end of the first hot air pipe (4) is communicated and connected with the combustion air inlet end of the combustor (2).
6. The multi-stage combustion based water heating system of claim 4, wherein: the inner cavity of the combustion heating furnace body (23) is also coaxially wrapped with a water heating furnace core (31), the water heating furnace core (31) is of a gyro-shaped sealed metal shell structure, and a water heating cavity (34) is arranged in the heating furnace core (31); a combustion annular cavity (30) is formed between the outer wall of the water heating furnace core (31) and the inner wall of the combustion heating furnace body (23); the lower end of the combustion ring cavity (30) is communicated with the upper end of the ethanol steam generation cavity (10); the lower part of the combustion annular cavity (30) is a conical combustion annular cavity (21.1) in a horn opening shape, and the upper part of the combustion annular cavity (30) is a cylindrical combustion annular cavity (21.2); a heat exchange water pipe (33) is spirally and spirally arranged in the cylindrical combustion ring cavity (21.2); the top of the cylindrical combustion ring cavity (21.2) is communicated with a first smoke exhaust pipe (25);
the device also comprises a filter (29) and a transition water pipe (28); the water outlet end of the cold water inlet pipe (26) is communicated and connected with the water inlet end at the upper end of the heat exchange water pipe (33), the water outlet end at the lower end of the heat exchange water pipe (33) is communicated with the water inlet end of the filter (29), the water outlet end of the filter (29) is communicated with the water inlet end of the transition water pipe (28), and the water outlet end of the transition water pipe (28) is communicated with the upper end of the water heating cavity (34); the water inlet end of the hot water outlet pipe (24) extends into the bottom of the water heating cavity (34);
the water heating cavity is characterized by further comprising a plurality of hard heat exchange smoke pipes (17) distributed in a bundle shape, the middle of each hard heat exchange smoke pipe (17) vertically penetrates through the water heating cavity (34), and the lower end of each hard heat exchange smoke pipe (17) is communicated with a smoke discharge end at the upper end of the cylindrical combustion chamber (7); the upper end of each hard heat exchange smoke pipe (17) is connected with a second smoke exhaust pipe (19).
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| CN201810418060.3A CN108662606B (en) | 2018-05-04 | 2018-05-04 | Water heating system based on multistage combustion |
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| CN206176410U (en) * | 2016-09-18 | 2017-05-17 | 江苏金牛环保工程设备有限公司 | Alcohol takes off water vapor heating system |
| CN107763843A (en) * | 2017-11-20 | 2018-03-06 | 苏州极汇科技有限公司 | A kind of water body firing equipment and its method |
| CN107676977A (en) * | 2017-11-20 | 2018-02-09 | 苏州极汇科技有限公司 | A kind of industrial heat-conducting oil heating system and its method |
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Effective date of registration: 20191203 Address after: No.16 Dongsheng Road, Baoying County, Yangzhou City, Jiangsu Province Applicant after: Baoying Hengtai Electrical Equipment Factory Address before: 226002 General Park Building No. 14, Chongchuan District, Nantong City, Jiangsu Province Applicant before: Nantong Jin Ling Intelligent Technology Co., Ltd. |
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