CN205424986U - Flue gas backward flow formula steam boiler low oxygen combustion system - Google Patents
Flue gas backward flow formula steam boiler low oxygen combustion system Download PDFInfo
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- CN205424986U CN205424986U CN201520893133.6U CN201520893133U CN205424986U CN 205424986 U CN205424986 U CN 205424986U CN 201520893133 U CN201520893133 U CN 201520893133U CN 205424986 U CN205424986 U CN 205424986U
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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
Abstract
The utility model discloses a flue gas backward flow formula steam boiler low oxygen combustion system, include: steam boiler, combustor and flue gas pipeline. This system further includes: first heat exchanger, it includes flue gas flow path and air flow path in locating flue gas pipeline, the gas supply pipe way, gas supply pipe connects on the way between the hot -air export and combustor of the air flow path of first heat exchanger, flue gas branch reflux pipe, flue gas branch reflux pipe's entry end communicates with flue gas pipeline between high -temperature exhaust gas outlet and first heat exchanger, flue gas branch reflux pipe's exit end and gas supply pipe way intercommunication, second heat exchanger, second heat exchanger just lie in first heat exchanger low reaches in locating flue gas pipeline on flue gas flow direction, the second heat exchanger includes flue gas flow path and fluid flow path, and the both ends of the fluid flow path of second heat exchanger form cold water entry and hot water export respectively, and set up at the cold water entry of second heat exchanger and the screw rod generator in the pipeline between the hot water export.
Description
Technical field
This utility model relates to a kind of boiler plant, particularly to a kind of steam boiler combustion system.
Background technology
Steam boiler is a kind of burning energy supplying system being widely used at present, and its energy consumption is big, seriously polluted.Natural gas is used to instead of the conventional boiler using coal cinder as fuel as the steam boiler part of raw material, but its energy loss brought and the pollution problem to environment are still the research emphasis of industry so far, existing research is not concerned only with and manufactures the steam boiler that research and development are novel, also pays close attention to the reducing energy consumption to existing steam boiler.
A kind of steam boiler flue gas waste heat recovery system as disclosed in Chinese patent discloses No. 203323157U, this system includes steam boiler, the exhanst gas outlet of steam boiler is provided with heat exchanger, heat exchanger includes casing, dividing plate it is provided with in casing, casing is divided into upper and lower two independent exhaust gases passes and cooled gas path by dividing plate, the heat pipe running through exhaust gases passes and cooled gas path it is provided with in casing, the import of exhaust gases passes is connected with exhanst gas outlet, and the outlet of cooled gas path is connected with the burner hearth of steam boiler.But, this steam boiler flue gas waste heat recovery system suffers from the drawback that or not enough: (1), heat exchanger use finned heat conducting pipe structure, and heat exchange efficiency is low；(2), due to oxygen content height in burning gases, cause the oxynitride in flue gas and carbon dioxide content high, do not meet low-carbon environment-friendly requirement.
And for example Chinese patent discloses No. 204593429U a kind of split combustion type gas steam boiler gas saving system disclosed, including gas-steam boiler, heat exchange of heat pipe and chimney, flue entrance at the cold side of heat exchange of heat pipe connects the blower fan for introducing the new wind of low temperature, the heat exchange of heat pipe exit position being connected with this flue entrance is connected split burner, the gas outlet of split burner is connected with the air inlet of gas-steam boiler, the gas outlet of gas-steam boiler connects energy-saving appliance, the gas outlet of this energy-saving appliance is connected with the hot side flue entrance of heat exchange of heat pipe, the heat exchange of heat pipe outlet being connected with this hot side flue entrance is connected with chimney.But, this split combustion type gas steam boiler gas saving system suffers from the drawback that or not enough: (1), despite the use of energy-saving appliance and heat exchange of heat pipe two grades utilize fume afterheat, but the most clearly disclose energy-saving appliance structure and with the annexation of other element of system；(2), due to oxygen content height in burning gases, cause the oxynitride in flue gas and carbon dioxide content high, do not meet low-carbon environment-friendly requirement.
Therefore it provides a kind of energy utilization rate is high and can effectively reduce the steam boiler low oxygen combustion system of environmental pollution and becomes urgent problem in the industry.
Summary of the invention
The purpose of this utility model is to provide a kind of smoke backflow formula steam boiler low oxygen combustion system, its can by the control in natural gas injection direction and by assuring that low oxygen combustion and ensure combustion efficiency, thus effectively reduce the discharge of harmful products of combustion, and efficient flue gas waste heat recycling can be carried out and be easy to existing steam boiler is transformed.
According to scheme of the present utility model, there is provided a kind of smoke backflow formula steam boiler low oxygen combustion system, including: steam boiler, for the burner of jet flames combustion heat release in steam boiler and for the high-temperature flue gas on steam boiler being exported the flue being connected to chimney.Wherein, this smoke backflow formula steam boiler low oxygen combustion system farther includes: First Heat Exchanger, and First Heat Exchanger is located in flue, and First Heat Exchanger includes flue gas flow path and air flow circuit；Gas transfer pipeline, flow through First Heat Exchanger air flow circuit air with flow through the high-temperature flue gas heat exchange of flue gas flow path after combustion-supporting through being delivered to burner by gas transfer pipeline；And smoke backflow arm, the arrival end of smoke backflow arm connects with flue with between First Heat Exchanger in high-temperature flue gas outlet, and the port of export of smoke backflow arm connects so that the partial fume in flue is back to together with preheated air burner combustion-supporting with gas transfer pipeline.
Preferably, this system farther includes the blender being located in gas transfer pipeline, the first paragraph pipeline that gas transfer pipeline is divided between First Heat Exchanger and blender by blender and the second segment pipeline between blender and burner, blender includes air and smoke inlet, fuel gas inlet and mixed gas outlet, the first paragraph pipeline connection of air and smoke inlet and gas transfer pipeline, mixed gas outlet and the second segment pipeline connection of gas transfer pipeline, fuel gas inlet is connected to fuel gas source by fuel gas pipeline, the combustion gas from fuel gas inlet and the preheated air of the first paragraph pipeline from gas transfer pipeline and backflow flue gas is made to be mixed into fuel gas mixture in blender, fuel gas mixture passes through the second segment Pipeline transport of gas transfer pipeline to burner combustion via mixed gas outlet.
Selectively, it is combustion-supporting that flue gas directly can be delivered to burner together with preheated air by gas transfer pipeline, and uses single blast tube to burner delivery of fuel gas.According to the program, then can not use blender.
Wherein, combustion gas can be natural gas, coal gas, liquefied petroleum gas etc., it is preferred to use natural gas.
Selectively, burner includes that interior combustion barrel, interior combustion barrel are internally formed flame of centre passage, and the second segment pipeline of gas transfer pipeline and flame of centre channel connection are to burn in the fuel gas mixture from blender is delivered to burner.Specifically, interior combustion barrel include being located at the first fuel gas mixture entrance of end wall, the flame of centre outlet being located at another end wall and neighbouring flame of centre outlet be located at interior combustion barrel within for shortening flame of centre length in case the spark arrester of anti-avulsion fire, the first fuel gas mixture entrance and the second segment pipeline connection of gas transfer pipeline.
Wherein, spark arrester can be for avoiding any element of de-fire in prior art.De-fire is also known as " flame disengaging ".When the flow velocity of fresh combustion mixture exceedes flame propagation velocity, make flame front can not stay fixed and along carrying out the phenomenon that flow path direction is propagated.De-fire can cause flameout, it is therefore necessary to avoids.
Selectively, spark arrester can be porous ceramic plate, honeycomb ceramic plate, porous stainless steel plate or heating resisting metal silk screen etc..
Preferably, burner farther includes to be nested with the outer combustion barrel in interior combustion barrel periphery, space between inwall and the outer wall of interior combustion barrel of outer combustion barrel forms external flame passage, smoke backflow formula steam boiler low oxygen combustion system farther includes the isocon for a part for the fuel gas mixture from blender branches to external flame passage, to carry out subchannel burning in the fuel gas mixture from blender is delivered to flame of centre passage and external flame passage respectively.Specifically, outer combustion barrel include being positioned at one end blind end, be positioned at the external flame outlet of the other end, neighbouring blind end is located at the second fuel gas mixture entrance of sidewall, the second segment pipeline of isocon connection gas transfer pipeline and the second fuel gas mixture entrance of outer combustion barrel.
Wherein, the setting of spark arrester makes to be coated with than by short and by external flame channel injection the flame of the flame of external flame channel injection by the flame of flame of centre channel injection so that flame flameholding on the whole.
More preferably, second fuel gas mixture entrance of outer combustion barrel is arranged along the tangential direction of outer combustion barrel, make flame be rotating flame export to the periphery in peripheral passage of flame to advance, and form external flame at combustor external and rotate the fired state of cladding flame of centre, making flame holding more preferable, efficiency of combustion is higher.
Wherein, the ratio distributing the fuel gas mixture to flame of centre passage and external flame passage arbitrarily can set according to concrete application conditions, it is therefore preferable to 1:0.5～2, such as 1:1.
Selectively, interior combustion barrel is gradually-reducing shape adjacent to one end that flame of centre exports, outer combustion barrel adjacent to one end that external flame exports also in gradually-reducing shape, to avoid flame excessively to dissipate.Such as, the sectional area starting interior combustion barrel and outer combustion barrel from the rear of spark arrester is gradually reduced.
Selectively, fuel gas pipeline is provided with constant pressure valve in order to make burner Flame stable to the combustion gas of blender conveying specified pressure.
Selectively, steam boiler include boiler body, the combustor being located at boiler body bottom, be located at above combustor for the drum being filled with water and connect combustor and high-temperature flue gas outlet water in making flue gas and drum and carry out the smoke-fire-tube of heat exchange, wherein, burner is located at the end wall of boiler body and is burnt for jet flames in combustor.
Selectively, steam boiler can be the steam boiler of the disposable type can bought on market, such as large-size horizontal steam boiler.
Selectively, First Heat Exchanger includes shell, housing interior volume is divided into the median septum of the most parallel flue gas flow path and air flow circuit, if and the dry heat pipe being located in median septum, wherein, the evaporation ends of heat pipe extends in flue gas flow path, the condensation end of heat pipe extends in air flow circuit, the two ends of flue gas flow path form high-temperature flue gas entry and middle temperature exhanst gas outlet respectively, the two ends of air flow circuit form cool air inlet and hot air outlet respectively, the high-temperature flue gas entry of First Heat Exchanger and the high-temperature flue gas outlet of steam boiler, the hot air outlet of First Heat Exchanger connects with gas transfer pipeline.
Wherein, the working medium in the heat pipe of First Heat Exchanger is the working medium such as the naphthalene being applicable to 300 degrees centigrade operating modes.
nullSelectively，Farther include the second heat exchanger and screw rod electromotor，Second heat exchanger is located in flue and is positioned at First Heat Exchanger downstream on flow of flue gas direction，Second heat exchanger includes shell、Housing interior volume is divided into the median septum of the most parallel flue gas flow path and fluid flowing path、And if the dry heat pipe being located in median septum，Wherein，The evaporation ends of heat pipe extends in flue gas flow path，The condensation end of heat pipe extends in fluid flowing path，The two ends of flue gas flow path form middle temperature smoke inlet and low-temperature flue gas outlet respectively，The two ends of fluid flowing path form cold water inlet and hot water outlet respectively，Hot water from the hot water outlet of the second heat exchanger passes through pipelined to screw rod electrical power generators，Become cold water after hot water generating acting to be delivered to the cold water inlet of the second heat exchanger from screw rod electromotor and be again heated into hot water thus form power generation circuit.
Wherein, the working medium in the heat pipe of the second heat exchanger is the working medium such as the water or the ammonia that are applicable to 150 degrees centigrade operating modes.
Selectively, First Heat Exchanger and/or the second heat exchanger can also be surface-type heat exchanger, such as pipe heat exchanger or plate-fin heat exchanger.
Wherein, the oxygen content (volume) of the preheated air in the first paragraph pipeline of gas transfer pipeline and backflow flue gas gaseous mixture is set as 12%～18%, the most about 15%.
The flue-gas temperature discharged after First Heat Exchanger is of about 120 degrees Celsius, air themperature after First Heat Exchanger preheats is about 130 degrees Celsius, temperature from the high-temperature flue gas entry of steam boiler is about 250 degrees Celsius, thus, preheated air and the temperature of backflow flue gas gaseous mixture in the first paragraph pipeline of gas transfer pipeline are set as 170-200 degree Celsius, the most about 180 degrees Celsius.
Wherein, the backflow flue gas entering gas transfer pipeline is set as accounting for 10～30% (volume) of the amount of flue gas emission in flue.
The beneficial effects of the utility model are: (1), the high-temperature flue gas discharged from steam boiler are partly into First Heat Exchanger and preheat combustion air, another part enters after gas transfer pipeline mixes mutually with the air after preheating and is again introduced into burn cycle, therefore the energy to high-temperature flue gas has carried out repeatedly utilizing, and efficiency of energy utilization is greatly improved；(2), owing to introducing hypoxia flue gas so that burner carries out low oxygen combustion, the most finally it is discharged into the oxynitride in the flue gas of environment and carbon dioxide substantially reduces, reduce the pollution level to environment；(3), preheated air and combustion-supporting being conducive to of high-temperature flue gas is used to improve efficiency of combustion；(4), the interior combustion barrel of burner employing is nested with structure with outer combustion barrel, and uses spark arrester so that flame of centre is shorter than external flame and is coated with by external flame, flameholding, has both avoided de-fire, has improve again efficiency of combustion；(5), this utility model by increasing members and supporting simple pipeline and connecting (such as heat-pipe heat exchanger and blower fan etc.) after, the reducing energy consumption to existing steam boiler can be realized, therefore utilization and extention has a extensive future.
Accompanying drawing explanation
Fig. 1 shows the schematic diagram of this utility model smoke backflow formula steam boiler low oxygen combustion system.
Fig. 2 shows the schematic diagram of the First Heat Exchanger of this utility model smoke backflow formula steam boiler low oxygen combustion system.
Fig. 3 shows the schematic diagram of the burner of this utility model smoke backflow formula steam boiler low oxygen combustion system.
Fig. 4 shows the schematic diagram of another embodiment of this utility model smoke backflow formula steam boiler low oxygen combustion system.
Detailed description of the invention
Refer to Fig. 1, according to a kind of embodiment of the present utility model, smoke backflow formula steam boiler low oxygen combustion system of the present utility model includes: steam boiler 100, burner 120, flue 160, First Heat Exchanger 300 and blender 500.
Steam boiler 100 includes the high-temperature flue gas outlet 101 being located at top, and flue 160 connects the high-temperature flue gas produced in steam boiler 100 is expelled to chimney (not shown) with high-temperature flue gas outlet 101.Burner 120 is located on the end wall 111 of steam boiler 100, for jet flames combustion heat release in the combustor of steam boiler 100.
First Heat Exchanger 300 is located in flue 160 to utilize fume afterheat to heat air, and it is combustion-supporting that the air after preheating is delivered to burner 120.Refer to Fig. 2, if First Heat Exchanger 300 includes shell 350, shell 350 inner space is divided into the most parallel flue gas flow path 360 and the median septum 380 of air flow circuit 370 and the dry heat pipe 390 being located in median septum.The evaporation ends 391 of heat pipe 390 extends in flue gas flow path 360, the condensation end 392 of heat pipe 390 extends in air flow circuit 370, the two ends of flue gas flow path 360 form high-temperature flue gas entry 310 and middle temperature exhanst gas outlet 320 respectively, and the two ends of air flow circuit 370 form cool air inlet 330 and hot air outlet 340 respectively.The high-temperature flue gas entry 310 of First Heat Exchanger 300 exports 101 by flue 160 with the high-temperature flue gas of steam boiler 100 and connects.Wherein, the working medium in the heat pipe of First Heat Exchanger 300 is to be applicable to the naphthalene of 300 degrees centigrade operating modes.
Blender 500 includes air and smoke inlet 510, fuel gas inlet 520 and mixed gas outlet 530.Air and smoke inlet 510 are connected with the hot air outlet 340 of First Heat Exchanger 300 by the first paragraph pipeline 710 of gas transfer pipeline.Fuel gas inlet 520 is connected to fuel gas source (not shown) by fuel gas pipeline 610, is provided with constant pressure valve 650, in order to carry the combustion gas of specified pressure to blender 500 so that burner 120 Flame is more stable in fuel gas pipeline 610.The mixed gas outlet 530 of blender 500 is connected to burner 120 by the second segment pipeline 750 of gas transfer pipeline.In this non-limiting embodiment, combustion gas is natural gas.
The arrival end 721 of smoke backflow arm 720 connects with the sidewall of flue 160 between high-temperature flue gas outlet 101 and the high-temperature flue gas entry 310 of First Heat Exchanger 300 of steam boiler 100, the port of export 722 of smoke backflow arm 720 connects with the sidewall of the first paragraph pipeline 710 of gas transfer pipeline, to mix constituting about the hypoxia flue gas of about 230 degrees Celsius of cumulative volume 20% in flue 160 preheated air with about 130 degrees Celsius of the hot air outlet 340 from First Heat Exchanger 300, the oxygen content of empty cigarette gaseous mixture is about 15% (volume), temperature is about 180 degrees Celsius.Empty cigarette gaseous mixture enters blender 300 by first paragraph pipeline 710 under the effect of blower fan 400, and then it is combustion-supporting to be back to burner 120.
Refer to Fig. 3, burner 120 is include interior combustion barrel 121 and the outer combustion barrel 122 of combustion barrel 121 periphery including being nested with, interior combustion barrel 121 is internally formed flame of centre passage 1218, and the space between inwall and the outer wall of interior combustion barrel 121 of outer combustion barrel 122 forms external flame passage 1228.
Interior combustion barrel 121 includes that being located at the first fuel gas mixture entrance 1215 of end wall 1211, the flame of centre outlet 1216 being located at the other end and neighbouring flame of centre outlet 1216 is located at the spark arrester 1219 within interior combustion barrel.First fuel gas mixture entrance 1215 connects with the second segment pipeline 750 of gas transfer pipeline.In this non-limiting embodiment, spark arrester 1219 is porous ceramic plate.Additionally, interior combustion barrel 121 is gradually-reducing shape adjacent to one end of flame of centre outlet 1216.
Outer combustion barrel 122 include being positioned at one end blind end 1221, be positioned at the external flame outlet 1226 of the other end, neighbouring blind end 1221 is located at the second fuel gas mixture entrance 1225 of sidewall.Isocon 760 connects the second segment pipeline 750 of gas transfer pipeline and the second fuel gas mixture entrance 1225 of outer combustion barrel 122, to burn in about 50% (volume) of the fuel gas mixture from blender 300 branches to external flame passage 1228.Additionally, outer combustion barrel 122 exports one end of 1226 also in gradually-reducing shape adjacent to external flame.
The setting of spark arrester 1219 makes shorter than the flame sprayed by external flame passage 1228 and by external flame channel injection the flame of the flame sprayed by flame of centre passage 1218 be coated with so that flame flameholding on the whole.In this non-limiting embodiment, second fuel gas mixture entrance 1225 of outer combustion barrel 122 is arranged along the tangential direction of outer combustion barrel, make flame be rotating flame export 1226 to the periphery in peripheral passage of flame 1228 to advance, end at burner 120 forms external flame and rotates the fired state of cladding flame of centre, making flame holding more preferable, efficiency of combustion is higher.
As a kind of non-limiting example, steam boiler 100 include boiler body 110, the combustor (not shown) being located at boiler body bottom, be located at above combustor for the drum (not shown) being filled with water and connect combustor and high-temperature flue gas outlet water in making flue gas and drum and carry out the smoke-fire-tube (not shown) of heat exchange, wherein, burner 120 is located at the end wall 111 of boiler body and is burnt for jet flames in combustor.
In running, export in the high-temperature flue gas of about 250 degrees Celsius of 101 about 80% from the high-temperature flue gas of steam boiler 100 and enter First Heat Exchanger 300 by flue 160 air at room temperature from blower fan (not shown) is heated.About the 20% of amount of flue gas emission is entered by smoke backflow arm 720 in the first paragraph pipeline 710 of gas transfer pipeline and mix with the preheated air from about 130 degrees Celsius of First Heat Exchanger 300, and then entrance blender 500 is interior mixes with natural gas.Fuel gas mixture respectively enters the flame of centre passage 1218 of burner 120 by the second segment pipeline 750 of gas transfer pipeline and isocon 760 and external flame passage 1228 carries out subchannel burning.Wherein, the middle temperature flue-gas temperature discharged after First Heat Exchanger 300 is about 120 degrees Celsius.Preheated air and the temperature of backflow flue gas gaseous mixture in the first paragraph pipeline 710 of gas transfer pipeline are about 180 degrees Celsius.Preheated air and the oxygen content (volume) of backflow flue gas gaseous mixture in the first paragraph pipeline 710 of gas transfer pipeline are about 15%.
As a kind of alternative embodiments, refer to Fig. 4, other side is identical with above-mentioned embodiment, difference is, farther including the second heat exchanger 800 and screw rod electromotor 900, the second heat exchanger 800 is located in flue 160 and is positioned at First Heat Exchanger 300 downstream on flow of flue gas direction.Second heat exchanger 800 includes shell, housing interior volume is divided into the median septum of the most parallel flue gas flow path and fluid flowing path, if and the dry heat pipe being located in median septum, wherein, the evaporation ends of heat pipe extends in flue gas flow path, the condensation end of heat pipe extends in fluid flowing path, the two ends of flue gas flow path form middle temperature smoke inlet 810 and low-temperature flue gas outlet 820 respectively, the two ends of fluid flowing path form cold water inlet 830 and hot water outlet 840 respectively, hot water from the hot water outlet 840 of the second heat exchanger 800 is generated electricity to screw rod electromotor 900 by pipelined, become cold water after hot water generating acting to be delivered to the cold water inlet 830 of the second heat exchanger 800 from screw rod electromotor 900 and be again heated into hot water thus form power generation circuit.Wherein, the structure of the second heat exchanger 800 is similar to the structure of First Heat Exchanger 300, and difference is that the working medium in heat pipe is to be applicable to the ammonia of 150 degrees centigrade operating modes.
According to this alternative embodiments, become the hot water of about 100 degrees Celsius to be delivered to screw rod electromotor 900 by water pump cool water heating in the second heat exchanger 800 further from the middle temperature flue gases of about 120 degrees Celsius of First Heat Exchanger 300 to generate electricity, become after hot water generating in the cold water of about 60 degrees Celsius is again introduced into the second heat exchanger 800 and heat.Flue gas becomes the low-temperature flue gas of about 80 degrees Celsius in the second heat exchanger 800 and is expelled to chimney after heat exchange.
Although described preferred implementation of the present utility model in detail at this, it is to be understood that this utility model is not limited to the concrete structure describing in detail here and illustrating, in the case of without departing from spirit and scope of the present utility model, may be effected by one skilled in the art other modification and variant.Such as, the quantity of burner suitably can increase according to concrete workload demand, or burner can use common burner, the burner of combustion barrel in such as only having.Additionally, the parameter such as temperature, pressure or content in this utility model suitably can be chosen in scope disclosed in the utility model according to concrete application conditions.
Claims (10)
1. a smoke backflow formula steam boiler low oxygen combustion system, the burner including: steam boiler, being located at the end wall of described steam boiler and the flue of the high-temperature flue gas outlet being connected to described steam boiler, it is characterized in that, described smoke backflow formula steam boiler low oxygen combustion system farther includes:
First Heat Exchanger, described First Heat Exchanger is located in described flue, and described First Heat Exchanger includes flue gas flow path and air flow circuit；
Gas transfer pipeline, described gas transfer pipeline is connected between hot air outlet and the described burner of the described air flow circuit of described First Heat Exchanger；
Smoke backflow arm, the arrival end of described smoke backflow arm connects with described flue with between described First Heat Exchanger in the outlet of described high-temperature flue gas, and the port of export of described smoke backflow arm connects with described gas transfer pipeline；
Second heat exchanger, described second heat exchanger is located in described flue and is positioned at described First Heat Exchanger downstream on flow of flue gas direction, described second heat exchanger includes that flue gas flow path and fluid flowing path, the two ends of the described fluid flowing path of described second heat exchanger form cold water inlet and hot water outlet respectively；And
Screw rod electromotor, described screw rod electromotor is arranged in the pipeline between described cold water inlet and the described hot water outlet of described second heat exchanger.
2. smoke backflow formula steam boiler low oxygen combustion system as claimed in claim 1, it is characterized in that, farther include the blender being located in described gas transfer pipeline, the first paragraph pipeline that described gas transfer pipeline is divided between described First Heat Exchanger and described blender by described blender and the second segment pipeline between described blender and described burner, described blender includes air and smoke inlet, fuel gas inlet and mixed gas outlet, the described first paragraph pipeline connection of described air and smoke inlet and described gas transfer pipeline, described mixed gas outlet and the described second segment pipeline connection of described gas transfer pipeline, described fuel gas inlet is connected to fuel gas source by fuel gas pipeline.
3. smoke backflow formula steam boiler low oxygen combustion system as claimed in claim 2, it is characterized in that, described burner includes that interior combustion barrel, described interior combustion barrel are internally formed flame of centre passage, the described second segment pipeline of described gas transfer pipeline and described flame of centre channel connection.
4. smoke backflow formula steam boiler low oxygen combustion system as claimed in claim 3, it is characterized in that, described interior combustion barrel includes that being located at the first fuel gas mixture entrance of end wall, the flame of centre outlet being located at another end wall and neighbouring described flame of centre outlet is located at the described second segment pipeline connection of the spark arrester within described interior combustion barrel, described first fuel gas mixture entrance and described gas transfer pipeline.
5. smoke backflow formula steam boiler low oxygen combustion system as claimed in claim 4, it is characterized in that, described burner farther includes to be nested with the outer combustion barrel in described interior combustion barrel periphery, space between inwall and the outer wall of described interior combustion barrel of described outer combustion barrel forms external flame passage, and described smoke backflow formula steam boiler low oxygen combustion system farther includes isocon.
6. smoke backflow formula steam boiler low oxygen combustion system as claimed in claim 5, it is characterized in that, described outer combustion barrel include being positioned at one end blind end, be positioned at the external flame outlet of the other end, neighbouring described blind end is located at the second fuel gas mixture entrance of sidewall, described isocon connects the described second segment pipeline of described gas transfer pipeline and the described second fuel gas mixture entrance of described outer combustion barrel.
7. smoke backflow formula steam boiler low oxygen combustion system as claimed in claim 6, it is characterised in that described interior combustion barrel is gradually-reducing shape adjacent to one end that described flame of centre exports, and described outer combustion barrel is gradually-reducing shape adjacent to one end that described external flame exports.
8. the smoke backflow formula steam boiler low oxygen combustion system as according to any one of claim 2～7, it is characterised in that be provided with constant pressure valve in described fuel gas pipeline.
9. the smoke backflow formula steam boiler low oxygen combustion system as according to any one of claim 1～7, it is characterized in that, described steam boiler include boiler body, the combustor being located at described boiler body bottom, be located at above described combustor for the drum being filled with water and the smoke-fire-tube connecting the outlet of described combustor and described high-temperature flue gas, wherein, described burner and described combustion chamber.
10. the smoke backflow formula steam boiler low oxygen combustion system as according to any one of claim 1～7, it is characterized in that, described First Heat Exchanger includes shell, described housing interior volume is divided into the most parallel described flue gas flow path and the median septum of described air flow circuit, if and be located in the dry heat pipe in septum plate, wherein, the evaporation ends of heat pipe extends in described flue gas flow path, the condensation end of heat pipe extends in described air flow circuit, the two ends of described flue gas flow path form high-temperature flue gas entry and middle temperature exhanst gas outlet respectively, the two ends of described air flow circuit form cool air inlet and hot air outlet respectively, the described high-temperature flue gas entry of described First Heat Exchanger and the described high-temperature flue gas outlet of described steam boiler, the described hot air outlet of described First Heat Exchanger connects with described gas transfer pipeline.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520893133.6U CN205424986U (en) | 2015-11-10 | 2015-11-10 | Flue gas backward flow formula steam boiler low oxygen combustion system |
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| CN201520893133.6U CN205424986U (en) | 2015-11-10 | 2015-11-10 | Flue gas backward flow formula steam boiler low oxygen combustion system |
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| CN205424986U true CN205424986U (en) | 2016-08-03 |
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