CN116792734A - Gas steam boiler with premixed water-cooling combustion and enhanced heat exchange of pipe coupling plate - Google Patents
Gas steam boiler with premixed water-cooling combustion and enhanced heat exchange of pipe coupling plate Download PDFInfo
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- CN116792734A CN116792734A CN202310918508.9A CN202310918508A CN116792734A CN 116792734 A CN116792734 A CN 116792734A CN 202310918508 A CN202310918508 A CN 202310918508A CN 116792734 A CN116792734 A CN 116792734A
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- 238000010168 coupling process Methods 0.000 title claims abstract description 102
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 102
- 230000008878 coupling Effects 0.000 title claims abstract description 99
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 94
- 238000001816 cooling Methods 0.000 title claims abstract description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 133
- 239000007789 gas Substances 0.000 claims abstract description 55
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000003546 flue gas Substances 0.000 claims abstract description 36
- 238000009833 condensation Methods 0.000 claims abstract description 11
- 230000005494 condensation Effects 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 11
- 230000008569 process Effects 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 24
- 239000010959 steel Substances 0.000 claims description 24
- 238000007789 sealing Methods 0.000 claims description 20
- 238000003466 welding Methods 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 7
- 239000011148 porous material Substances 0.000 claims description 7
- 238000005530 etching Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 6
- 238000003698 laser cutting Methods 0.000 claims description 6
- 238000001704 evaporation Methods 0.000 claims description 5
- 239000004927 clay Substances 0.000 claims description 4
- 239000012774 insulation material Substances 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims 1
- 238000012546 transfer Methods 0.000 abstract description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052799 carbon Inorganic materials 0.000 abstract description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 6
- 239000003345 natural gas Substances 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- 239000003344 environmental pollutant Substances 0.000 abstract 1
- 231100000719 pollutant Toxicity 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 15
- 229920006395 saturated elastomer Polymers 0.000 description 10
- 239000012528 membrane Substances 0.000 description 6
- 230000002708 enhancing effect Effects 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/22—Methods of steam generation characterised by form of heating method using combustion under pressure substantially exceeding atmospheric pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/10—Water tubes; Accessories therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/26—Steam-separating arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a gas steam boiler for premixing water-cooling combustion and enhanced heat exchange of a pipe coupling plate, which comprises a blower, a burner, a pipe coupling plate premixing water-cooling combustion pipe screen, a pipe coupling plate fin enhanced heat exchange pipe bundle, a film wall descending pipe screen, a spiral fin convection pipe bundle and an energy-saving condensation pipe bundle; air and natural gas fed by an air blower are mixed in a premixer and then pass through a pipe coupling plate to premix a water-cooled combustion pipe screen, then the surface combustion is completed by ignition, high-temperature flue gas after combustion flows through gaps between pipe coupling plate fin reinforced heat exchange pipe bundles to strengthen heat transfer, then spiral fin convection pipe bundles and energy-saving condensation pipe bundles are flushed for the second time, and deep cooling and condensation are carried out, and the flue gas is discharged from a chimney; the water in the lower header flows through the heat exchange tube bundle and is heated to water vapor, and the water vapor is discharged from the air outlet of the upper header. The invention can greatly improve heat exchange efficiency, reduce pollutant discharge, make the boiler structure more compact, reduce flow resistance, simplify the process, and realize the reduction of carbon discharge from the whole supply chain of raw materials, production, processing and operation.
Description
Technical Field
The invention relates to the technical field of gas boilers, in particular to a gas steam boiler for premixing water-cooling combustion and enhanced heat exchange of a pipe coupling plate.
Background
The gas steam boiler has the characteristics of high efficiency, energy saving, environmental protection, safety, stable operation, convenient maintenance and strong adaptability, and a large amount of gas steam boilers between 0.1 and 10 steam tons are still required to be used as energy sources in the industries of textile, chemical industry, food processing and the like. The gas-steam boilers in the market at present are various, but the existing gas-steam boilers such as CN219177670U applied by Chongqing light-forest heat energy equipment Co., ltd, CN107781800A applied by Shanghai Yanno boiler manufacturing Co., ltd, and the like have low combustion efficiency, large combustion resistance and nitrogen oxide emission higher than 30mg/m 3 The carbon emission is high, the requirements of national energy conservation and emission reduction are not met, the traditional flue gas turbulence is adopted to strengthen heat transfer, the strengthening capability is weak, the required heating surface of the boiler is greatly increased, the number of heat exchange tube bundles is increased, the material cost and the welding workload are increased, and the process carbon emission is greatly increased.
Disclosure of Invention
In order to solve the problems of the gas steam boiler, the invention aims to provide a gas steam boiler with premixed water-cooling combustion and enhanced heat exchange of a pipe coupling plate, which adopts an annular water-cooling combustion pipe screen, wherein adjacent light pipes of a heat exchange pipe bundle of the annular water-cooling combustion pipe screen are welded by adopting flat steel, and two rows of radial holes are formed on the flat steel, so that mixed gas forms cross flow outside the flat steel, flame stability is improved after ignition and combustion, flame length is reduced, flame temperature is reduced, and nitrogen oxide emission of the gas burner is less than 30mg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The combustion efficiency is more than 99.8%, and compared with the traditional domestic burner, the combustion resistance can be reduced by 40%, and the carbon emission can be effectively reduced by more than 10% -30%; the tube coupling plate-fin enhanced heat exchange tube bundles adopting 'laminar flow enhanced' heat exchange are adopted, a gap channel is formed between the tube coupling plate-fin enhanced heat exchange tube bundles, the gap channel formed between the adjacent coupling fin evaporation heat exchange tube bundles can eliminate a central high temperature region in the traditional heat exchange process, when flue gas passes through the gap channel, the whole channel is in a boundary layer region with strong heat and mass transfer, and the heat exchange coefficient can reach 130W/m 2 And the temperature is higher than DEG C.
In order to achieve the above purpose, the invention adopts the following technical scheme: a gas steam boiler with premixed water-cooling combustion and enhanced heat exchange of pipe coupling plates adopts vertical arrangement, and comprises a burner, a pipe coupling plate premixed water-cooling combustion pipe screen, a pipe coupling plate fin enhanced heat exchange pipe bundle, a film wall descending pipe screen, a spiral fin convection pipe bundle, an energy-saving condensation pipe bundle, an upper steam water chamber, a lower water chamber, a boiler shell and a chimney; the tube coupling plate premixing water-cooling combustion tube panel, the tube coupling plate fin reinforced heat exchange tube bundle and the film wall descending tube panel are concentrically arranged from inside to outside, an annular space between the tube coupling plate premixing water-cooling combustion tube panel and the tube coupling plate fin reinforced heat exchange tube bundle is a hearth, a flue gas channel is formed in the space between the tube coupling plate fin reinforced heat exchange tube bundle and the film wall descending tube panel, and the spiral fin convection tube bundle, the energy-saving condensation tube bundle and the chimney are arranged on one side of a boiler shell along the flue gas flow direction; the upper steam water chamber and the lower water chamber are annular headers, and the pipe coupling plate premixing water-cooling combustion pipe screen, the pipe coupling plate fin reinforced heat exchange pipe bundle, the film wall descending pipe screen and the spiral fin convection pipe bundle are communicated with the upper steam water chamber and the lower water chamber; the tube coupling plate-fin reinforced heat exchange tube bundle is provided with a slit type flue gas channel; the burner is arranged at the top center position.
The spiral fin convection bank has arranged three rows, the upper end and the lower extreme of first row spiral fin convection bank stretch into the bottom and the top of upper portion vapour hydroecium and lower part hydroecium respectively, the base tube of second row and third row spiral fin convection bank is buckled into "C" type, upper end and the lower extreme of second row and third row spiral fin convection bank stretch into upper portion vapour hydroecium and lower part hydroecium from the lateral surface of upper portion vapour hydroecium and lower part hydroecium respectively, pipe coupling plate mixes water-cooling combustion tube screen upper end and lower extreme in advance and stretches into upper portion vapour hydroecium and lower part hydroecium from the medial surface of upper portion vapour hydroecium and lower part hydroecium respectively.
The coupling fin evaporation heat exchange tube bundle adopts a folded fin tube, the folded fin tube comprises a base tube and fins, the base tube adopts a necking light tube, the fins comprise folded fins and front fins which are connected with each other, the front fins are connected with the light tube, a folded angle is formed between the folded fins and the front fins, the folded fins are suspended, and longitudinal ribs are arranged on the surfaces of the fins; the fin is bent and set to enable the folded fin of the previous tube to be parallel to the front fin of the next tube, the thickness of the initial end of the fin is maximum, the thickness of the folded fin is gradually reduced along the airflow direction, the thickness of the folded fin is unchanged along the airflow direction, a gap channel is formed between the folded fin of the previous tube and the front fin of the next tube, and the width of the gap channel between the folded fin of the previous tube and the front fin of the next tube is 0.2-1 mm; the inner and outer grooves of the base tube and the fins are connected by adopting TIG welding, MIG welding or laser welding, the base tube is made of materials specified by gas boiler standards, and the fins are made of materials with heat conductivity coefficients not lower than 200W/(m.K).
The longitudinal ribs comprise rectangular longitudinal ribs or wavy longitudinal ribs arranged on the outer side surfaces of the front fins and the inner side surfaces of the folded fins, and the rectangular longitudinal ribs and the wavy longitudinal ribs are formed by adopting laser cutting, stamping or etching processes;
or the longitudinal ribs are transverse and longitudinal staggered ribs, longitudinal staggered ribs and transverse and longitudinal staggered turbulence column ribs, the front wing outer side ribs and the folding wing inner side ribs are combined to form a labyrinth flue gas channel, and the transverse and longitudinal staggered ribs, the longitudinal staggered ribs and the transverse and longitudinal staggered turbulence column ribs are formed by adopting laser cutting, stamping and etching processes.
A heat insulation material with a lining is coated between the boiler shell plate and the film wall downcomer screen, and an annular space formed between the inner side surface of the steam-water chamber at the upper part and the flow equalizing pore plate is filled with refractory clay; the columnar space surrounded by the inner side of the lower water chamber is filled with refractory clay.
The annular premixed water-cooling combustion tube panel comprises a plurality of C-shaped heat exchange light tubes, flat steel is adopted to weld adjacent heat exchange light tubes, through holes are formed in the flat steel in a sequence or staggered mode at a set angle, the through holes are circular, diamond-shaped, rectangular or oblong, and the heat exchange tubes are vertically arranged to form the annular water-cooling combustion tube panel; the inner side of the tube coupling plate premixing water-cooling combustion tube panel is provided with a flow equalizing orifice plate which is cylindrical and is stopped at the sealing orifice plate at the top of the lower water chamber, the lower part of the sealing orifice plate of the upper steam water chamber is provided with an initial punching position, and the thickness of the flow equalizing orifice plate is 10-15 mm.
Two L-shaped folded plates are arranged on the inner side of the upper surface of the upper steam-water chamber, the two L-shaped folded plates are oppositely arranged, and the width and the height of one L-shaped folded plate are smaller than those of the other L-shaped folded plate; the outside of the lower water chamber is provided with a water supply inlet, the bottom of the lower water chamber is provided with a sealing plate, the top of the upper steam water chamber is provided with a safety valve, a steam outlet, a pressure gauge and a pressure sensor, and the side surface of the upper steam water chamber is provided with a water level gauge interface.
The top of the boiler shell is connected with the bottom of the upper steam water chamber and the outer edge of the top of the lower water chamber, surrounds the spiral fin convection tube bundle and the energy-saving condensation tube bundle, the tail of the boiler is connected with a flue shell with a square-to-round structure, the tail of the flue shell with the square-to-round structure is connected with a chimney, and a condensed water discharge hole is formed below the flue shell; the top central position of upper portion vapour hydroecium is provided with the combustor installation panel, and the combustor is fixed on the combustor installation panel, and the combustor is connected with the air-blower, and the orifice plate that flow equalizes welds below the combustor installation panel.
The upper header is arranged in the upper steam-water chamber inner ring, the lower header is arranged in the lower water chamber inner ring, a base pipe of a pipe coupling plate premixing water-cooling combustion pipe screen adopts a vertical necking light pipe, the upper end and the lower end of the base pipe respectively penetrate into the bottoms and the tops of the upper header and the lower header, and the upper surface of the upper steam-water chamber is a light plate.
An atomizer is arranged in the lower header, and an inlet of the atomizer is communicated with the lower water chamber.
The upper steam water chamber is communicated with the upper header by adopting an elbow, and the lower water chamber is communicated with the lower header by adopting an elbow.
The membrane type wall descending tube screen comprises a plurality of heat exchange tubes, the heat exchange tube bundles are vertically arranged, flat steel is adopted for welding and sealing between the adjacent heat exchange tubes, and the membrane type wall descending tube screen is arranged along a vortex line to form an isobaric flue gas channel with gradually increased width.
Compared with the prior art, the invention has at least the following beneficial effects:
the gas steam boiler adopting the concept of laminar flow reinforced heat exchange and adopting the premixed water-cooling combustion and reinforced heat exchange of the pipe coupling plate eliminates a central high-temperature region in the flue gas heat exchange process through the gap channel, so that the flue gas of the boiler can be reduced to below 280 ℃ from 1150 ℃ only by a flow with the length of 50-200 mm, and simultaneously the flue gas resistance is controlled below 1000Pa, thereby reducing the consumption of steel per ton and the water volume of the boiler; the gas steam boiler with the pipe coupling plate for premixing water-cooling combustion and enhanced heat exchange can realize full premixing water-cooling stable combustion of natural gas, effectively reduce flame length and flame temperature, and enable the nitrogen oxide emission of the gas burner to be less than 30mg/m 3 The combustion efficiency is more than 99.8%, compared with the traditional burner, the combustion resistance can be reduced by 40%, the carbon emission is effectively reduced by more than 10% -30%, and meanwhile, the boiler is more compact in structure due to the fact that the premixer is arranged inside, and the size of the boiler is further reduced.
Furthermore, the invention adopts the design concept of low flow speed and short flow, the energy saver is semi-internal, the condenser is external, the waste heat of the flue gas is fully utilized, the temperature of the flue gas is reduced to below 50 ℃, and the efficiency of the boiler is improved by more than 10%.
Furthermore, the core heat exchange element coupling fin evaporation heat exchange tube of the gas steam boiler for premixing water-cooling combustion and enhancing heat exchange of the tube coupling plate has the advantages that a natural V-shaped groove is formed between the base tube and the fins, the structure is simple, the large-scale processing and the production and the assembly are convenient, the fins are bent, longitudinal ribs are added, the heat exchange area is increased, meanwhile, a stable gap channel is formed between the front heat exchange tube bundle and the rear heat exchange tube bundle, and the effect of enhancing heat transfer is greatly improved.
Furthermore, the gas steam boiler with the premixed water-cooling combustion and enhanced heat exchange of the pipe coupling plate can adopt a mode that the whole burner is detachable, so that the maintenance and the overhaul of the burner are facilitated, the phase change in the water-cooling combustion tube bundle is enhanced, the heat transfer is enhanced, and the metal wall temperature is reduced.
Drawings
The invention will be described in detail with reference to the drawings and the detailed description.
FIG. 1a is a front cross-sectional view of a gas-steam boiler for premixed water-cooled combustion and enhanced heat transfer of a tube coupling plate according to the present invention; FIG. 1b is a top view of a gas steam boiler body for premixed water-cooled combustion and enhanced heat transfer of a tube coupling plate according to the present invention; FIG. 1c is a right side cross-sectional view of a tube coupling plate premix water cooled combustion and enhanced heat transfer gas steam boiler energy saving condenser of the present invention; FIG. 1d is a top right side view of a gas steam boiler for premixed water-cooled combustion and enhanced heat transfer of a tube coupling plate according to the present invention;
FIG. 2a is a schematic view of a tube bundle of a tube coupling plate premixed water-cooled combustion and enhanced heat exchange gas steam boiler welded with radial Kong Biangang annular water-cooled combustion tube panels according to the present invention; FIG. 2b is a schematic view of square holes formed in annular water-cooled burner tube bundle steel at a certain angle, and FIG. 2c is a schematic view of round holes formed in annular water-cooled burner tube bundle steel at a set angle; FIG. 2d is a schematic illustration of circular holes in annular water-cooled burner tube panel bundle steel at an angle different from FIG. 2 c; FIG. 2e is a schematic view of diamond holes formed in a tube bundle steel sheet of an annular water-cooled burner tube panel at a set angle;
FIG. 3a is a schematic view of a tube bundle 4 of tube-coupling plate-fin enhanced heat exchange tubes in partial cross-section using a tube bundle of folded-fin finned tubes to form a jet, turbulent, laminar enhanced heat transfer channel; FIG. 3b is a schematic view of a tube bundle forming a laminar flow enhanced heat transfer channel of the tube coupling plate-fin enhanced heat exchange tube bundle 4 using a tube bundle of folded-fin finned tubes; fig. 3c is a schematic view of a slit channel formed by rectangular longitudinal ribs 431 and 432 of a fin-folded fin tube of the tube coupling plate-fin enhanced heat exchange tube bundle 4; FIG. 3d is a schematic view of a slit channel formed by corrugated longitudinal ribs 431, 432 in a tube-coupling plate-fin enhanced heat exchanger tube bundle 4; fig. 3e is a perspective view of a slit channel formed by the tube coupling plate-fin reinforced heat exchange tube bundle 4 using transverse and longitudinal staggered ribs; FIG. 3f is a perspective view of a slit channel formed by longitudinally staggered ribs of tube-coupling plate-fin enhanced heat exchange tube bundle 4; fig. 3g is a perspective view of a slit channel formed by the tube coupling plate-fin reinforced heat exchange tube bundle 4 by using transverse and longitudinal staggered turbulent flow column ribs;
FIG. 4 is a schematic view of a tube coupling plate premixed water-cooled combustion and enhanced heat exchange gas steam boiler annular membrane wall downcomer screen 5 of the present invention;
FIG. 5 is a front cross-sectional view of the upper steam-water chamber 8 of the gas steam boiler for premixed water-cooled combustion and enhanced heat exchange of the tube coupling plate of the present invention;
FIG. 6 is a front cross-sectional view of the lower water chamber 9 of the gas steam boiler for premixed water-cooled combustion and enhanced heat exchange of the tube coupling plate of the present invention;
FIG. 7 is a schematic diagram of flow equalizing orifice plates and different hole shapes of a gas steam boiler for premixed water-cooled combustion and enhanced heat exchange of a tube coupling plate according to the present invention;
FIG. 8 is a schematic view of a tube coupling plate premixed water-cooled combustion and enhanced heat exchange gas steam boiler of the present invention with membrane wall downcomer screens arranged along the vortex line to form an isobaric flue gas channel;
FIG. 9a is a front cross-sectional view of a tube coupling plate premix water cooled combustion and enhanced heat transfer gas steam boiler of the present invention employing a burner integral removable version of the output superheated steam; FIG. 9b is a top right view of a tube coupling plate premix water cooled combustion and enhanced heat transfer gas steam boiler employing a burner assembly removable solution according to the present invention; FIG. 9c is a top left side view of a tube coupling plate premix water cooled combustion and enhanced heat transfer gas steam boiler employing a burner assembly removable solution according to the present invention; FIG. 9d is a schematic diagram of a gas steam boiler with tube coupling plate premixed water-cooled combustion and enhanced heat transfer for outputting saturated steam using a burner integral removable scheme according to the present invention;
fig. 10 is a schematic diagram of an atomizer 20 added when the burner-integrated detachable scheme is adopted to output superheated steam in a gas steam boiler for premixed water-cooled combustion and enhanced heat exchange of a tube coupling plate according to the present invention.
1-blower, 2-burner, 3-tube coupling plate premix water cooled burner tube panel, 4-tube coupling plate fin enhanced heat exchange tube bundle, 5-membrane wall downcomer panel, 6-spiral fin convection tube bundle, 7-energy saving condenser tube bundle, 8-upper steam-water chamber, 9-lower water chamber, 10-boiler shell, 11-square round structure, 12-chimney, 13-flow equalizing orifice plate, 14-safety valve, 15-condensate drain hole, 16-burner mounting panel, 18-sealing plate, 19- "L" -shaped folded plate, 171-first sealing orifice plate, 172-second sealing orifice plate, 20-atomizer, 21-burner head, 22-natural gas and air flow through premixer, 41-base tube, 42-fin, 43-longitudinal rib, 431-rectangular longitudinal rib, 432-wavy longitudinal rib, 81-upper header, 91-lower header,
Detailed Description
The invention will be described in detail with reference to the drawings and the detailed description.
The invention provides a gas steam boiler with a pipe coupling plate for premixing water-cooling combustion and enhancing heat exchange, which is provided with an annular water-cooling combustion pipe screen and a gas steam boiler with a built-in premixer, so that the whole volume of the boiler is reduced, the structure is more compact, mixed gas can form a cross flow after the annular water-cooling combustion pipe screen after secondary rectification, high-temperature flue gas can flow back on a water-cooling pipe bundle, the flame temperature is effectively reduced, the flame length is reduced, the combustion stability is increased, the emission of nitrogen oxides is further reduced, and meanwhile, a gap microchannel laminar flow enhanced heat transfer technology is adopted, so that the heat exchange efficiency is obviously improved.
As shown in fig. 1a and 1b, the boiler is arranged vertically, and comprises a blower 1, a burner 2, a tube coupling plate premixing water-cooling combustion tube panel 3, a tube coupling plate fin reinforced heat exchange tube bundle 4, a film wall descending tube panel 5, a spiral fin convection tube bundle 6, an energy-saving condensation tube bundle 7, an upper steam water chamber 8, a lower water chamber 9, a boiler shell 10, a chimney 12 and a safety valve 14; three rings of annular tube rows are radially arranged along the boiler, an inner ring tube bundle consists of a plurality of C-shaped heat exchange light tubes, the distance between the heat exchange tubes is larger than 5mm, flat steel is adopted for welding between the heat exchange tubes, two rows of radial holes are formed in the flat steel, and the heat exchange tubes are vertically arranged to form an annular water-cooling combustion tube screen; the middle ring tube bundle comprises a plurality of coupling finned tubes which are vertically arranged to form a gap channel tube coupling plate-fin reinforced heat exchange tube bundle 4; the plurality of heat exchange tube bundles of the outer ring are vertically arranged, flat steel is adopted for welding and sealing between adjacent heat exchange tubes, a film type wall descending tube screen 5 is formed, and the film type wall descending tube screen 5 is annular; the back section of the boiler is vertically provided with three rows of spiral fin convection tube bundles 6 in staggered manner, the tail part of the boiler is transversely provided with four rows of energy-saving condensation tube bundles 7 formed by bending a water pipe, a membrane wall descending tube screen 5, a tube coupling plate fin reinforced heat exchange tube bundle 4, the upper end and the lower end of a first row of spiral fin convection tube bundles 6 respectively extend into the bottoms and the tops of an upper steam water chamber 8 and a lower water chamber 9, the base pipes of a second row and a third row of spiral fin convection tube bundles 6 are bent into a C shape, the upper end and the lower end of the second row and the third row of spiral fin convection tube bundles 6 respectively extend into the upper steam water chamber 8 and the lower water chamber 9 from the outer side surfaces of the upper steam water chamber 8 and the lower water chamber 9, the upper end and the lower end of a tube coupling plate premixed water-cooling combustion tube screen 3 respectively extend into the upper steam water chamber 8 and the lower water chamber 9 from the inner side surfaces of the upper steam water chamber 8 and the lower water chamber 9, an annular space between the tube coupling plate premixed water-cooling tube fin reinforced heat exchange tube bundle 4 is a hearth, and the space between the tube coupling plate premixed water-cooling tube bundle fin reinforced heat exchange tube bundle 4 forms a flue gas channel; the upper steam water chamber 8 and the lower water chamber 9 are annular headers; the outside of the lower water chamber 9 is provided with a water supply inlet, the bottom is provided with a sealing plate 18, the top of the upper steam water chamber 8 is provided with a safety valve 14, a steam outlet, a pressure gauge, a pressure sensor and a burner mounting panel 16, the side surface is provided with a water level gauge interface, and two L-shaped folded plates 19 are arranged below the steam outlet and on the inner side of the upper surface of the upper steam water chamber 8; the bottom surface of the upper steam water chamber 8 and the top surface of the lower water chamber 9 are welded with a sealing orifice plate, the top of the boiler shell 10 is connected with the bottom of the upper steam water chamber 8 and the outer edge of the top of the lower water chamber 9, all heat exchange pipes are surrounded, the tail part of the boiler is connected with a flue shell of a square-turn round structure 11, the tail part of the flue shell of the square-turn round structure 11 is connected with a chimney 12, and a condensed water discharge hole 15 is formed below the chimney; the burner 2 is fixed on a burner mounting panel 16, the burner mounting panel 16 is arranged at the center of the top surface of the upper steam chamber 8, and a cylindrical flow equalizing orifice 13 is welded below the burner mounting panel 16; the heat insulation material of the inner lining is coated between the boiler shell plate 10 and the film wall downcomer screen 5, so that the heat dissipation loss of the boiler is greatly reduced.
As shown in fig. 1b, after the natural gas and the air are fully mixed by the premixer 22, under the constraint of the first sealing orifice plate 171 and the burner mounting panel 16, the mixed gas passes through the holes of the flow equalizing orifice plate 13 first in the radial direction, then passes through the holes of the flat steel of the premixed water-cooled combustion tube panel 3, and is ignited and combusted, the high-temperature flue gas formed after combustion carries out laminar flow enhanced heat exchange along the gaps between the tube coupling plate-fin enhanced heat exchange tube bundles 4, the temperature of the flue gas is reduced after heat exchange, the flue gas enters the flue gas channel formed by the annular space between the tube coupling plate-fin enhanced heat exchange tube bundles 4 and the film wall downcomer 5, moves towards the tail part of the boiler, under the constraint of the flat steel between the tube bundles of the film wall downcomer 5 and the tube coupling plate-fin enhanced heat exchange tube bundles 4, the flue gas after cooling continues to flow backwards to flush the spiral fin convection tube bundles 6, the flue gas is discharged into the atmosphere through the chimney 12 after being condensed, and the produced condensed water is discharged through the condensed water discharge hole 15.
As shown in fig. 1c, fig. 1d and fig. 5, boiler feedwater at 20 ℃ is introduced into a water inlet below the energy-saving condenser, flows forwards along the energy-saving condenser tube bundle 7, turns 180 degrees horizontally when reaching the other side of the energy-saving condenser, continues to flow along the energy-saving condenser tube bundle 7, turns 180 degrees upwards when reaching the water inlet side, meanders along a pipeline, finally obtains boiler feedwater at 90 ℃ from an outlet above the energy-saving condenser, is introduced into the lower water chamber 9 from the water outlet header 24, and is uniformly distributed among the tube coupling plate premixed water-cooling combustion tube screen 3, the tube coupling plate fin reinforced heat exchange tube bundle 4, the film wall downcomer tube screen 5 and the spiral fin convection tube bundle 6 after entering the upper water chamber 8, and after the boiler feedwater flows upwards, absorbs heat and gasifies to become water vapor, the vapor turns four times under the constraint of the L-shaped folded plate 19, passes through a vapor outlet above the upper vapor chamber 8, and saturated vapor is output.
As shown in fig. 2a, fig. 2b, fig. 2C, fig. 2d and fig. 2e, the annular premixed water-cooling combustion tube panel 3 comprises a plurality of 'C' -shaped heat exchange light tubes, flat steel is adopted among the heat exchange tubes for welding, two through holes are formed in the flat steel in a sequence or staggered manner at a set angle, the through holes can be round, diamond-shaped, rectangular or oblong, the heat exchange tubes are vertically arranged to form the annular water-cooling combustion tube panel, and mixed gas passes through holes at two sides of a single heat exchange tube to form staggered air flow, so that high-temperature flue gas after ignition combustion flows back to the water-cooling tube bundle, the flame temperature and flame length can be further reduced, and NO is further reduced x Concentration.
As shown in fig. 3a to 3d, the tube coupling plate-fin reinforced heat exchange tube bundle 4 adopts a folded fin tube, the folded fin tube comprises a base tube 41 and fins 42, the base tube 41 adopts a necking light tube, the necking light tube is characterized in that the diameter of the joint between two ends of the light tube and the tube plate is reduced, the fins 42 comprise folded fins and front fins which are mutually connected, the front fins are connected with the light tube, a folding angle is formed between each folded fin and each front fin, the folded fins are suspended, the fins 42 are folded at a certain angle to enable the folded fins of the front tube to be parallel to the front fins of the next tube, the outer sides of the front fins and the inner sides of the folded fins of the fins adopt a laser cutting, stamping or etching process to form rectangular longitudinal ribs 431 or wavy longitudinal ribs 432, and a gap channel with the width of 0.2-1 mm is formed between the folded fins of the front tube bundle and the front fins of the next tube bundle; the thickness of the initial end of the fin 42 is maximum, the thickness is gradually reduced along the air flow direction, the thickness of the folded fin along the air flow direction is unchanged, and the purpose is to improve the strength and stability of the fin; the inner and outer grooves of the base tube 41 and the fins 42 are formed, and TIG welding, MIG welding or laser welding is adopted to form jet flow, turbulence and laminar flow enhanced heat transfer channels, or the inner sides of the fins and the space of the base tube are filled after welding to form the laminar flow enhanced heat transfer channels; the base pipe 41 is made of a material specified by a gas boiler standard, the fins 42 are not pressure-bearing pieces, and the base pipe is made of a material with a heat conductivity coefficient not lower than 200W/m.K;
as shown in fig. 3e to 3g, the longitudinal ribs 43 may also be formed by laser cutting, stamping and etching, such as transverse and longitudinal staggered ribs, longitudinal staggered ribs and transverse and longitudinal staggered turbulent flow column ribs, and the front fin outer ribs and the folded fin inner ribs are combined to form a "labyrinth flue gas channel", so that the heat of the flue gas is transferred to the water in the tube bundle more, and the heat transfer is enhanced;
as shown in fig. 4, the film type wall descending tube panel 5 adopts necking light tubes, the light tubes are distributed along an arc line, and flat steel seals are welded between adjacent heat exchange tubes;
as shown in fig. 5, the annular space formed by the burner mounting panel 16, the flow equalizing orifice 13, the first sealing orifice 171 and the inner side surface of the upper steam-water chamber 8 is filled with refractory mortar, so that the heat dissipation loss of the boiler is reduced to the greatest extent;
as shown in fig. 6, the cylindrical space formed between the second sealing orifice 172 above the lower water chamber 9 and the sealing plate 18 below is filled with refractory mortar, minimizing the heat dissipation loss of the boiler;
as shown in fig. 5, 6 and 7, the flow equalizing orifice 13 is welded below the burner mounting panel 16, and the second sealing orifice 172 is stopped above the lower water chamber 9, and the starting punching position is below the first sealing orifice 171 of the upper steam chamber 8, so that the thickness of the flow equalizing orifice 13 is about 10-15 mm for better rectification, in fig. 7, the holes a are round, the holes b are diamond, the holes c are oblong, and the holes can also be rectangular.
As shown in fig. 8, the film wall downcomer screen 5 may also be arranged along the vortex line to form an isobaric flue gas channel with a continuously increased flue gas channel width, so that the flue gas distribution is more uniform and the flue gas circulation is smoother.
As shown in fig. 9a, fig. 9b and fig. 9c, the gas steam boiler adopting the pipe coupling plate for premixing water-cooling combustion and enhancing heat exchange can also adopt a mode that the burner 2 can be disassembled to output superheated steam, when the scheme is adopted, the difference is that an upper header 81 and a lower header 91 are added, the upper header 81 is of an annular structure, the upper surface and the lower surface of the upper header 81 are respectively flush with the upper surface and the lower surface of an upper steam chamber 8, the lower header 91 is of an annular structure, the upper surface and the lower surface of the lower header 91 are respectively flush with the lower water chamber 9, the outer surfaces of the upper header 81 and the lower header 91 are closely attached to the inner surface of the lower water chamber of the upper steam chamber 8, a vertical necking light pipe is adopted for a base pipe of the pipe water-cooling combustion tube panel 3, the upper end and the lower end of the base pipe are respectively penetrated into the bottom and the top of the upper header 81 and the lower header 91, a saturated steam outlet, a safety valve 14, a water level gauge interface is arranged on the side of the pressure sensor, two upper 'L' -shaped face plates 19 are not arranged on the inner side of the upper steam chamber 8, and an atomizer 20 is arranged on the upper face plate and the upper header 91 is arranged on the inner side of the upper face of the steam chamber; the boiler feed water at 20 ℃ is introduced into a water inlet below the energy-saving condenser, flows forwards along the energy-saving condensing tube bundle 7, turns horizontally by 180 degrees when reaching the other side of the energy-saving condenser, continuously flows along the energy-saving condensing tube bundle 7, turns upwards by 180 degrees when reaching the water inlet side, so that the boiler feed water at 90 ℃ finally flows along a pipeline in a meandering manner, and finally is obtained from an outlet above the energy-saving condenser, the high-temperature boiler feed water is introduced into a lower water chamber 9 through a pipeline, and uniformly distributed in a tube coupling plate premixed water-cooling combustion tube bundle 3, a tube coupling plate fin reinforced heat exchange tube bundle 4, a film wall downcomer tube bundle 5 and a spiral fin convection tube bundle 6 after entering the lower water chamber 9, the boiler feed water absorbs heat and is gasified to become water vapor while flowing upwards, saturated vapor generated in an upper steam-water chamber 8 is introduced into a lower header 91 through a pipeline, at this moment, the atomizer 20 gasifies the water vapor from the lower water chamber, increases the water content of the saturated vapor, and the saturated vapor with increased water content uniformly distributes the saturated vapor in each tube coupling plate premixed water-cooling combustion tube bundle 3, flows upwards after being heated, becomes superheated vapor and is discharged from a superheated vapor outlet.
As shown in fig. 9d, the gas steam boiler with the pipe coupling plate for premixing water-cooling combustion and enhanced heat exchange can also adopt a mode that the burner 2 is integrally and detachably used for outputting saturated steam, the upper steam water chamber 8 and the upper header 81 are communicated by adopting an elbow, the lower water chamber 9 and the lower header 91 are also communicated by adopting an elbow, the steam generated by the upper header 81 enters the upper steam water chamber 8 through the elbow, the finally generated saturated steam is discharged from a steam outlet above the upper steam water chamber, and the atomizer 20 is not arranged in the lower header 91. .
As shown in fig. 10, the atomizer 20 is in a circular ring shape, is placed in the lower header 91, atomizes boiler feed water from the lower water chamber 9, and increases saturated steam humidity.
In summary, the invention provides a gas steam boiler with premixed water-cooling combustion and enhanced heat exchange by a pipe coupling plate, and provides an annular water-cooling combustion pipe screen, wherein a heat exchange pipe bundle of the water-cooling combustion pipe screen adopts a light pipe bent into a C shape, flat steel is welded at the middle part of an adjacent C-shaped light pipe, and two rows of radial holes are formed, so that mixed gas forms a staggered flow at the outer side of the flat steel, flame stability is improved after ignition and combustion, flame length is reduced, flame temperature is reduced, and nitrogen oxide emission of a gas burner is less than 30mg/m 3 . The combustion efficiency is more than 99.8%, and compared with the traditional domestic burner, the combustion resistance can be reduced by 40%, and the carbon emission can be effectively reduced by more than 10% -30%; the efficient laminar flow enhanced heat transfer element is provided, namely a folded fin tube, a heating surface adopts folded fin formed by bending trapezoid straight fins, the fins are bent at a certain angle to enable the folded fins of a previous tube bundle to be parallel to the front fins of a next tube bundle, longitudinal ribs are welded on the outer sides of the front fins and the inner sides of the folded fins of the fins, a gap channel with the width of 0.2-1 mm is formed between the folded fins of the previous tube bundle and the front fins of the next tube bundle, the gap channel formed between the adjacent coupling fin evaporation heat exchange tube bundles can eliminate a central high temperature area in the traditional heat exchange process, when flue gas passes through the gap channel, the whole channel is in a boundary layer area with strong heat and mass transfer, and the heat exchange coefficient can reach 130W/m 2 And the temperature is higher than DEG C.
Claims (12)
1. The gas steam boiler is characterized by adopting vertical arrangement, and comprises a burner (2), a tube coupling plate premixing water-cooling combustion tube panel (3), a tube coupling plate fin reinforced heat exchange tube bundle (4), a film wall descending tube panel (5), a spiral fin convection tube bundle (6), an energy-saving condensation tube bundle (7), an upper steam-water chamber (8), a lower water chamber (9), a boiler shell (10) and a chimney (12); the tube coupling plate premixing water-cooling combustion tube panel (3), the tube coupling plate fin reinforced heat exchange tube bundle (4) and the film wall descending tube panel (5) are concentrically arranged from inside to outside, an annular space between the tube coupling plate premixing water-cooling combustion tube panel (3) and the tube coupling plate fin reinforced heat exchange tube bundle (4) is a hearth, a flue gas channel is formed in the space between the tube coupling plate fin reinforced heat exchange tube bundle (4) and the film wall descending tube panel (5), and the spiral fin convection tube bundle (6), the energy-saving condensation tube bundle (7) and the chimney (12) are arranged on one side of the boiler shell (10) along the flue gas flow direction; the upper steam-water chamber (8) and the lower water chamber (9) are annular headers, and the pipe coupling plate premixing water-cooling combustion pipe screen (3), the pipe coupling plate fin reinforced heat exchange pipe bundle (4), the film type wall descending pipe screen (5) and the spiral fin convection pipe bundle (6) are communicated with the upper steam-water chamber (8) and the lower water chamber (9); the tube coupling plate-fin reinforced heat exchange tube bundle (4) is provided with a slit type flue gas channel; the burner (2) is arranged at the top center position.
2. The gas steam boiler of the premixed water-cooled combustion and the intensified heat exchange of the tube coupling plate according to claim 1, wherein three rows of the spiral fin convection tube bundles (6) are arranged, the upper end and the lower end of the first row of the spiral fin convection tube bundles (6) respectively extend into the bottoms and the tops of the upper steam-water chamber (8) and the lower water chamber (9), the base tubes of the second row and the third row of the spiral fin convection tube bundles (6) are bent into a 'C', the upper end and the lower end of the second row and the third row of the spiral fin convection tube bundles (6) respectively extend into the upper steam-water chamber (8) and the lower water chamber (9) from the outer side surfaces of the upper steam-water chamber (8) and the lower water chamber (9), and the upper end and the lower end of the premixed water-cooled combustion tube panel (3) respectively extend into the upper steam-water chamber (8) and the lower water chamber (9) from the inner side surfaces of the upper steam-water chamber (8) and the lower water chamber (9).
3. The gas steam boiler for premixed water-cooled combustion and enhanced heat exchange of a tube coupling plate according to claim 1, wherein the tube bundle (4) for evaporating the coupling fin adopts a folded fin tube, the folded fin tube comprises a base tube (41) and fins (42), the base tube (41) adopts a necking light tube, the fins (42) comprise folded fins and front fins which are mutually connected, the front fins are connected with the light tube, a folded angle is formed between the folded fins and the front fins, the folded fins are suspended, and longitudinal ribs (43) are arranged on the surfaces of the fins (42); the fins (42) are bent and set to enable the folded fins of the previous tube to be parallel to the front fins of the next tube, the thickness of the initial ends of the fins (42) is largest, the thickness of the fins is gradually reduced along the air flow direction, the thickness of the folded fins of the previous tube is unchanged along the air flow direction, a gap channel is formed between the folded fins of the previous tube and the front fins of the next tube, and the width of the gap channel between the folded fins of the previous tube and the front fins of the next tube is 0.2-1 mm; the inside and outside of the base tube (41) and the fins (42) are beveled, the base tube (41) is made of materials specified by gas boiler standards by adopting TIG welding, MIG welding or laser welding, and the fins (42) are made of materials with the heat conductivity coefficient not lower than 200W/(m.K).
4. A gas steam boiler for premixed water-cooled combustion and enhanced heat exchange of a tube coupling plate according to claim 3, wherein the longitudinal ribs (43) comprise rectangular longitudinal ribs (431) or wavy longitudinal ribs (432) arranged on the outer side surfaces of the front fins and the inner side surfaces of the folded fins, and the rectangular longitudinal ribs (431) and the wavy longitudinal ribs (432) are formed by adopting a laser cutting, stamping or etching process;
or the longitudinal ribs (43) are transverse and longitudinal staggered ribs, longitudinal staggered ribs and transverse and longitudinal staggered turbulent flow column ribs, the front wing outer side ribs and the folding wing inner side ribs are combined to form a labyrinth flue gas channel, and the transverse and longitudinal staggered ribs, the longitudinal staggered ribs and the transverse and longitudinal staggered turbulent flow column ribs are formed by adopting laser cutting, stamping and etching processes.
5. The gas steam boiler with premixed water-cooled combustion and enhanced heat exchange by the pipe coupling plate according to claim 1, wherein a heat insulation material of a lining is coated between a boiler shell plate (10) and a film wall descending tube screen (5), and an annular space formed between the inner side surface of an upper steam-water chamber (8) and a flow equalizing pore plate (13) is filled with refractory clay; the columnar space surrounded by the inner side of the lower water chamber (9) is filled with refractory clay.
6. The gas steam boiler for premixed water-cooling combustion and enhanced heat exchange of the pipe coupling plate according to claim 1, wherein the annular premixed water-cooling combustion pipe screen (3) comprises a plurality of C-shaped heat exchange light pipes, flat steel is adopted for welding between adjacent heat exchange light pipes, through holes are formed in the flat steel in a sequential or staggered mode at a set angle, the through holes are round, diamond-shaped, rectangular or oblong, and the heat exchange pipes are vertically arranged to form the annular water-cooling combustion pipe screen; the inner side of the pipe coupling plate premixing water-cooling combustion pipe screen (3) is provided with a flow equalizing pore plate (13), the flow equalizing pore plate (13) is cylindrical, a sealing pore plate stopping at the top of the lower water chamber (9), the lower part of the sealing pore plate of the upper steam-water chamber (8) is provided with an initial punching position, and the thickness of the flow equalizing pore plate (13) is 10-15 mm.
7. The gas steam boiler for premixed water-cooled combustion and enhanced heat exchange of a tube coupling plate according to claim 1, wherein two L-shaped folded plates (19) are arranged on the inner side of the upper surface of the upper steam-water chamber (8), the two L-shaped folded plates (19) are oppositely arranged, and the width and the height of one L-shaped folded plate (19) are smaller than those of the other L-shaped folded plate (19); the outside of the lower water chamber (9) is provided with a water supply inlet, the bottom is provided with a sealing plate (18), the top of the upper steam-water chamber (8) is provided with a safety valve (14), a steam outlet, a pressure gauge and a pressure sensor, and the side surface is provided with a water level gauge interface.
8. The gas steam boiler with premixed water-cooled combustion and enhanced heat exchange by a pipe coupling plate according to claim 1, wherein the top of a boiler shell (10) is connected with the bottom of an upper steam-water chamber (8) and the outer edge of the top of a lower water chamber (9), surrounds a spiral fin convection tube bundle (6) and an energy-saving condensation tube bundle (7), the tail of the boiler is connected with a flue shell of a square-turn round structure (11), the tail of the flue shell of the square-turn round structure (11) is connected with a chimney (12), and a condensed water discharge hole (15) is formed below the chimney; the top center position of upper portion soda room (8) is provided with combustor installation panel (16), and combustor (2) are fixed on combustor installation panel (16), and combustor (2) are connected with air-blower (1), and flow equalizing orifice plate (13) welding is below combustor installation panel (16).
9. The gas steam boiler for premixing water-cooled combustion and enhanced heat exchange of a pipe coupling plate according to claim 1, wherein an upper header (81) is arranged at an inner ring of an upper steam-water chamber (8), a lower header (91) is arranged at an inner ring of a lower water chamber (9), a vertical necking light pipe is adopted as a base pipe of a pipe coupling plate premixing water-cooled combustion pipe screen (3), an upper end and a lower end of the base pipe respectively penetrate into the bottoms and the tops of the upper header (81) and the lower header (91), and the upper surface of the upper steam-water chamber (8) is a light plate.
10. The gas steam boiler with premixed water-cooled combustion and enhanced heat exchange by the pipe coupling plate according to claim 9, wherein an atomizer (20) is arranged in the lower header (91), and an inlet of the atomizer (20) is communicated with the lower water chamber (9).
11. The gas steam boiler with premixed water-cooled combustion and enhanced heat exchange by the pipe coupling plate according to claim 9, wherein the upper steam-water chamber (8) and the upper header (81) are communicated by an elbow, and the lower water chamber (9) and the lower header (91) are communicated by an elbow.
12. The gas steam boiler with premixed water-cooled combustion and enhanced heat exchange by the pipe coupling plate according to claim 1, wherein the film wall descending pipe screen (5) comprises a plurality of heat exchange pipes, the heat exchange pipe bundles are vertically arranged, flat steel welding sealing is adopted between the adjacent heat exchange pipes, and the film wall descending pipe screen (5) is arranged along a vortex line to form an isobaric flue gas channel with gradually increased width.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310918508.9A CN116792734A (en) | 2023-07-25 | 2023-07-25 | Gas steam boiler with premixed water-cooling combustion and enhanced heat exchange of pipe coupling plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310918508.9A CN116792734A (en) | 2023-07-25 | 2023-07-25 | Gas steam boiler with premixed water-cooling combustion and enhanced heat exchange of pipe coupling plate |
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| CN116792734A true CN116792734A (en) | 2023-09-22 |
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| CN202310918508.9A Pending CN116792734A (en) | 2023-07-25 | 2023-07-25 | Gas steam boiler with premixed water-cooling combustion and enhanced heat exchange of pipe coupling plate |
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| Country | Link |
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| CN (1) | CN116792734A (en) |
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- 2023-07-25 CN CN202310918508.9A patent/CN116792734A/en active Pending
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