CN209944755U - Modularization extrusion aluminium condensation heat exchanger structure and condensing boiler structure - Google Patents
Modularization extrusion aluminium condensation heat exchanger structure and condensing boiler structure Download PDFInfo
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- CN209944755U CN209944755U CN201920363590.2U CN201920363590U CN209944755U CN 209944755 U CN209944755 U CN 209944755U CN 201920363590 U CN201920363590 U CN 201920363590U CN 209944755 U CN209944755 U CN 209944755U
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Abstract
The utility model discloses a modular extruded aluminum condensation heat exchanger structure and a condensation type boiler structure, which form a single body, a left-right or an upper-lower split condensation type boiler according to the relative arrangement of a burner and an extruded aluminum condensation heat exchanger, and comprise an extruded aluminum heat transfer unit, an inlet gradually-expanding flue, a dew bearing disc, an inlet collection box, an outlet collection box, a full-premix fire grate type burner and the like; after extrusion forming, the aluminum bars are subjected to secondary processing and assembly to form extruded aluminum heat transfer units with complete water channels, and the extruded aluminum heat transfer units are combined to form a main body part of a condensation heat exchanger or a condensation boiler; the combustion head of the full-premix fire grate type combustor is deeply extruded between the aluminum heat transfer units, so that the problems of deformation and leakage caused by flame scouring of the sealing cover plate are avoided; the extruded aluminum material has the advantages of high tensile strength, low density and corrosion resistance, and the cost is only 30 percent of cast aluminum silicon and 60 percent of stainless steel; the surplus design of the extruded aluminum heat transfer unit improves the boiler efficiency by more than 6 percent, saves energy and gas and relieves the current situation of shortage of natural gas.
Description
Technical Field
The utility model relates to a fuel gas boiler and flue gas waste heat recovery technical field, concretely relates to modularization condensation heat exchanger structure of latent heat recovery in modularization condensation formula gas boiler structure and the fuel gas boiler tail gas with extruded aluminium as the material.
Background
In recent years, the haze problem persists, and after the heating season is entered, the haze is more frequent. In order to control haze and protect blue days, the heating industry provides a clean heating plan 2017-supplement 2021 in northern areas in winter, the clean heating rate is required to be 70% by 2021 year, and clean energy replaces heating to scatter 1.5 hundred million tons of coal. The natural gas consumption for heating in 2016 (363 hundred million m) in winter3The expected heating gas consumption can reach 640 hundred million m in 2021 years3In the above, the rapid development of the commercial gas heating boiler causes a huge gap to the natural gas supply, and by 2021, only one item of natural gas heating has 300 hundred million m3The above new supply gap. 2374 hundred million m of natural gas consumption in 20173The natural gas yield is 1536 hundred million m3838 hundred million m at the inlet3(ii) a The natural gas yield is predicted to rise to 1856 hundred million m by 202131000 hundred million meters at the entrance3Above, natural gas increment is 482 hundred million meters3. However, the natural gas in China firstly ensures urban supply and then is an industrial demand, and the newly added natural gas supply can only meet the increasing urban gas supply demandHowever, the huge gap of heating natural gas still cannot be satisfied.
The problem of huge gaps of heating natural gas is solved, and on one hand, the large gaps are open sources, and on the other hand, the large gaps are throttled. Throttling requires increasing the efficiency of the natural gas boiler to conserve natural gas. The existing central heating natural gas boiler can realize the condensation of flue gas only at low return water temperature (below 58 ℃), and utilizes the latent heat of water vapor in the flue gas. When the device is used for heating radiators, the return water temperature is generally over 60 ℃, and flue gas condensation cannot be realized by boiler return water, so that huge waste of latent heat of vapor in exhaust smoke is caused. The exhaust gas temperature of a 700kW gas-fired boiler is reduced from 80 ℃ to 35 ℃, 70kW heat can be recovered, the boiler efficiency is improved to 108%, and more than 12% of natural gas is saved. At present, steel boilers on the market are all provided with condensers and energy-saving devices, but the condensers are difficult to exert effects due to the overhigh return water temperature; meanwhile, in order to save cost, the existing condenser is made of ND steel materials mostly, and the condenser is easy to corrode and leak condensed water.
China's economy continues to develop at a high speed, fossil energy consumption increases year by year, air quality deteriorates increasingly, and haze frequently occurs all over the country. Relative humidity is more than 80% when the haze takes place in the heating season, and the high humidity environment is the prerequisite condition that the haze takes place, provides the excellent reaction hotbed for various secondary pollutant in the air. The large amount of fossil fuel is used, and a large amount of water vapor is discharged to the atmosphere, so that the original dry winter becomes wet, and favorable conditions are created for haze, and therefore the haze is controlled to be dehumidified firstly. A fuel gas heating unit discharges a great amount of wet steam to the atmosphere, a condensing heat exchanger is arranged at the tail of a fuel gas boiler, latent heat of vaporization is recovered, water vapor is removed, the humidity of exhaust smoke is reduced, and the aims of controlling haze and protecting blue sky are fulfilled.
At present, a condensing heat exchanger which can really realize condensation, is corrosion-resistant, low in manufacturing cost, good in heat exchange and compact in size is urgently needed in the market, the boiler efficiency is improved, the emission of water vapor is reduced, and environmental protection and economic benefits are considered. The existing condensing heat exchanger is made of stainless steel, cast aluminum silicon, copper alloy and the like, but the stainless steel has low heat conductivity coefficient, high cast aluminum silicon manufacturing cost and poor corrosion resistance of the copper alloy, the unit price of extruded aluminum is lower than that of the stainless steel, the heat conductivity coefficient is equivalent to that of the copper alloy, the corrosion resistance is excellent, and the condensing heat exchanger is the best material for the condensing heat exchanger. The tensile strength of the conventional 6063 series extruded aluminum alloy can reach more than 150MPa, and the aluminum alloy can be used for a long time in an environment with the pH value of 1 after being subjected to anodic oxidation and surface electrophoretic coating treatment and has good acid and salt resistance. The extruded aluminum material used for the condensing heat exchanger has great advantages compared with the traditional material, but no extruded aluminum condensing heat exchanger exists in the market at present, and the relevant design standard is lacked. The extruded aluminum condensing heat exchanger capable of being produced in batch in industrialization is designed by taking an extruded aluminum profile as a heat exchanger unit element, adding an enhanced heat transfer structure and an inlet and outlet connecting assembly.
A burner is added at the head of the extruded aluminum condensing heat exchanger, and part of external fins are cut off to increase the space of a hearth, so that the condensing boiler can be used. Compared with the traditional cast aluminum silicon and stainless steel condensing boiler, the condensing boiler made of extruded aluminum material has the advantage that the manufacturing cost can be reduced by more than 30%. The integrated extruded aluminum boiler requires that the burner is arranged between the extruded aluminum heat exchange units, has narrow space and higher combustion heat load; the requirement of low-nitrogen combustion is met, and the flame temperature in a combustion area is reduced by using the principles of built-in flue gas recirculation, reasonable air distribution, water-cooled flame and the like. The existing full-premixing low-nitrogen burner mostly adopts a panel type or cylindrical combustion head, and cannot meet the requirement of the burner of an integrated extruded aluminum boiler; the atmospheric burner adopts a fire grate structure to meet the space requirement, but the combustion heat intensity is lower, and the boiler power is lower. This patent will design the full premix combustor of a kind of fire row type, and the combustion head is placed between extrusion aluminium heat transfer unit, realizes higher burning heat load and low nitrogen burning.
Disclosure of Invention
In order to reduce the cost of the flue gas condensation heat exchanger and promote the development of the flue gas waste heat recovery technology of the fuel gas boiler, the utility model aims to provide a modularization extrusion aluminum condensation heat exchanger and an integrated extrusion aluminum condensation type boiler, the utility model solves the problems of easy corrosion, high cost and large occupied area of the flue gas condensation heat exchanger, recycles the flue gas waste heat by introducing various cold sources such as a heat pump, domestic water and the like, condenses and removes the vapor in the flue gas, promotes the development of the low-temperature waste heat recovery and flue gas whitening technology of the fuel gas boiler, and makes contribution to the reduction and elimination of haze; introduce condensing boiler system with the extruded aluminium material, through designing full premix fire grate type combustor, at condensation heat exchanger head installation combustor to the cutting part fin has solved condensing boiler cost too high, promotes slow problem, improves the utilization ratio of natural gas, makes a contribution for the current situation of alleviating the natural gas shortage.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a modularized extruded aluminum condensation heat exchanger structure comprises an extruded aluminum heat transfer unit 1, an inlet divergent flue 2, a dew bearing disc 3, an inlet header 4 and an outlet header 5; the inlet divergent flue 2 is positioned at the top of the extruded aluminum heat transfer unit 1, the dew bearing disc 3 is positioned at the bottom of the extruded aluminum heat transfer unit 1, the inlet header 4 and the outlet header 5 are arranged at the same side of the condensing heat exchanger and are connected with all the extruded aluminum heat transfer units 1, and the cooling working medium is heat pump evaporator circulating water, boiler feed water or tap water; the condensate is collected at the bottom of the dew-bearing disc 3 and is discharged through a U-shaped water-sealed pipe.
The extruded aluminum heat transfer unit 1 comprises a middle extruded aluminum sheet and left and right extruded aluminum sheets; the middle extruded aluminum sheet consists of four parts, namely a water chamber 1-1, an outer fin 1-2, an inner fin 1-3 and a connecting part 1-4; the water chamber 1-1 consists of a plurality of middle water chamber units with the length of 2 cm-10 cm and the width of 1 cm-3 cm and two end water chamber units with the length of 1 cm-4 cm and the width of 6 cm-15 cm, the wall thickness of the water chamber 1-1 is 4 mm-8 mm, and the multi-unit water chamber structure is beneficial to enhancing the pressure resistance of the boiler; the outer fins 1-2 are arranged on the outer surfaces of the two sides of the water chamber 1-1 and are in contact with the flue gas entering from the inlet divergent flue 2 for heat exchange, the fin-to-tongue ratio is less than 5, the width of the root part is 3 mm-10 mm, the height of each fin is 5 mm-50 mm, and the surfaces of the fins are in a sawtooth shape or a wave shape so as to increase the surface area of the fins and expand the heating surface; the inner fins 1-3 are arranged on the inner side of the water chamber 1-1, the fin-to-tongue ratio is less than 5, the root width is 2 mm-5 mm, the fin height is 4 mm-14 mm, and the surfaces of the fins are in sawtooth or wave shapes so as to increase the surface area of the fins and expand the heating surface; the connecting parts 1-4 are positioned on the short sides of the two sides of the water chamber units at the two ends and play a role in connecting the two adjacent extruded aluminum heat transfer units 1 and sealing the flue gas; the left and right extruded aluminum sheets also consist of four parts, namely a water chamber 1-1, an outer fin 1-2, an inner fin 1-3 and a connecting part 1-4, wherein the outer fin 1-2 and the connecting part 1-4 are only arranged on the smoke side of the water chamber 1-1, and the outer fin 1-2 and the connecting part 1-4 are not arranged on the air side of the water chamber 1-1.
The extruded aluminum heat transfer unit 1 is subjected to secondary processing after being extruded and formed by an extruder; cutting circular inlets 1-5 and circular outlets 1-6 with the diameter of 20-60 mm on the long side wall surfaces of the water chamber units at the two ends; screw holes are processed on the upper end surface and the lower end surface of the extruded aluminum heat transfer unit 1 and are used for fixing an upper sealing cover plate and a lower sealing cover plate; cutting off the wall surface of the water side channel 20-60 mm away from the upper end and the lower end of the water chamber 1-1 and the inner fins 1-3 to form a communicated water chamber space 1-8 with the height of 20-60 mm, and using the communicated water chamber space as an upper header and a lower header of a plurality of water side channels; cutting off the part of the outer fin 1-2 with the distance of 50-300 mm from the flue gas inlet, and reserving the root of the fin with the height of 2-5 mm to form a low fin area 1-10 of the inlet; a transition area 1-9 with the length of more than 100mm is obliquely cut between the short fin area 1-10 and the normal outer fin 1-2, the flow cross section of the flue gas is changed by changing the height of the outer fin, the flow velocity of the flue gas is controlled, and the over-high flow velocity of the flue gas at the inlet section is avoided; the surface of the extruded aluminum heat transfer unit 1 is subjected to anodic oxidation and electrophoretic coating treatment to enhance the condensate corrosion resistance.
The extruded aluminum heat transfer unit 1 is assembled with hexagonal socket head cap screws 1-11, sealing cover plates 1-12, flow equalizing plates 1-13 and flow cores 1-14 after secondary processing; the inner hexagonal screws 1-11 are used for fixing the sealing cover plates 1-12; the sealing cover plate 1-12 is provided with a counter bore, the side close to the end part of the extruded aluminum heat transfer unit 1 is provided with a sealing groove, a silica gel sealing ring is arranged in the sealing groove, and the upper end and the lower end of the extruded aluminum heat transfer unit 1 are sealed; the flow equalizing plate 1-13 is arranged between the communicated water chamber space 1-8 and the water chamber 1-1, and the water flow of each water chamber 1-1 is uniformly distributed by utilizing the resistance of the small holes; the flow core 1-14 is fixed by the flow equalizing plates 1-13 at the upper side and the lower side, consists of a plurality of cylinders or spiral cylinders penetrating through the water chamber 1-1, and is used for disturbing the flow of the water side, reducing the flow area of each water chamber 1-1, improving the flow velocity of the water side and strengthening the heat exchange of the water side; the cooling working medium enters the communicated water chamber spaces 1-8 at the lower part of the extruded aluminum heat transfer unit 1 through the circular inlets 1-5 at the lower part, enters each water chamber 1-1 through the lower parts of the flow equalizing plates 1-13 at the lower part, then leaves the water chamber 1-1 from the upper part of the flow equalizing plate 1-13 at the upper part, enters the communicated water chamber spaces 1-8 at the upper part, and leaves the extruded aluminum heat transfer unit 1 from the circular outlets 1-6.
The extruded aluminum heat transfer units 1 are connected with the inlet header 4 and the outlet header 5 in a soft connection mode, and the inlet header 4 and the outlet header 5 are arranged on the outer sides of all the extruded aluminum heat transfer units 1 and are connected with all the extruded aluminum heat transfer units 1; the thickness of the extruded aluminum wall is only 4 mm-8 mm, a threaded hole is directly tapped on the wall surface, the extruded aluminum wall is easy to slip and leak, and the inlet header 4 and the outlet header 5 are connected with the extruded aluminum heat transfer unit 1 by adopting an internal external thread joint 4-1, an external internal thread movable joint 4-2 and a silica gel sealing ring 4-3; the built-in external screw joint 4-1 is arranged in the water chamber units at two ends of the water chamber 1-1, the built-in external screw joint 4-1 extends out of the water chamber 1-1 through the round inlet 1-5 and the round outlet 1-6 to be connected with the external internal screw movable joint 4-2, and the silica gel sealing ring 4-3 is positioned between the circular ring fixing base of the built-in external screw joint 4-1 and the inner wall surface of the water chamber 1-1; the extruded aluminum heat transfer unit 1 is connected with the inlet divergent flue 2 and the dew containing disc 3 through flange bolts, semicircular bolt holes are reserved in sealing cover plates 1-12 at two ends of the extruded aluminum heat transfer unit 1, the semicircular bolt holes between the two sealing cover plates form complete bolt holes, the complete bolt holes correspond to the bolt holes in the connecting flange of the divergent flue 2 and the dew containing disc 3 one by one, a sealing gasket is added in the middle, and the bolt holes are connected through bolts.
A modularized extruded aluminum condensing boiler structure comprises an extruded aluminum heat transfer unit 1, a full-premix fire grate type burner 6, a dew bearing disc 3, an inlet header 4 and an outlet header 5; the modularized extruded aluminum condensing boiler is characterized in that an inlet gradually-expanded flue 2 is replaced by a full-premix fire-row type burner 6 on the basis of the modularized extruded aluminum condensing heat exchanger to form a single condensing boiler, an extruded aluminum heat transfer unit 1 is lengthened, partial outer fins of a flame area of a burner are cut off, and other components are unchanged; the full-premix fire grate type combustor 6 consists of a pressurizing fan cover 6-1, an isobaric gas distribution chamber 6-2, an ejector 6-3, a gas mixing cavity 6-4 and a combustion head 6-5; the flange plate at the upper end of the booster fan cover 6-1 is connected with a booster fan, the internal air pressure is greater than the atmospheric pressure, the injection capacity of the injector 6-3 is enhanced, and the excess air coefficient is greater than 1.1; the isobaric gas distribution chamber 6-2 is arranged below the supercharging fan cover 6-1, and the isobaric air channel design is adopted to ensure that each nozzle on the isobaric gas distribution chamber distributes equal amount of gas; the ejector 6-3 is arranged below each nozzle of the isobaric gas distribution chamber 6-2; the gas mixing cavity 6-4 is arranged below the ejector 6-3, the gas mixing cavity 6-4 is communicated with the isobaric gas distribution chamber 6-2 through a plurality of ejectors 6-3 and a plurality of nozzles on the isobaric gas distribution chamber 6-2, the gas injects air and then enters the gas mixing cavity 6-4, and the gas is uniformly mixed with the air; the combustion head 6-5 is communicated with the bottom of the gas mixing cavity 6-4 and distributed among the extruded aluminum heat transfer units 1, and the mixed gas leaves the gas mixing cavity 6-4 and then enters the combustion head 6-5 for combustion.
The combustion head 6-5 extends into a hearth space formed by the inlet short-fin region 1-10, the bottom 6-5-1 of the combustion head is fixed on a sealing cover plate 1-12 of the extruded aluminum heat transfer unit 1, the middle part 6-5-2 of the combustion head is in an isosceles trapezoid shape, and the head 6-5-4 of the combustion head is in a semicircular shape; the height of the middle part 6-5-2 of the combustion head is 50 mm-150 mm, triangular openings 6-5-3 are processed on the wall surface of the isosceles trapezoid section, and a negative pressure area formed by high-speed airflow in the combustion head 6-5 is used for ejecting positive pressure smoke in a hearth, so that combustion is delayed, a flame high-temperature area is weakened, and the generation of thermal nitrogen oxides is reduced; circular openings with the diameter of 2 mm-5 mm are uniformly distributed on the head part 6-5-4 of the combustion head for equalizing the flow of mixed gas and preventing tempering, and the combustion area of the semicircular head part 6-5-4 of the combustion head is increased by 50 percent compared with that of a flat head part; a layer of metal fiber mesh is wrapped outside the head part 6-5-4 of the combustion head, and the mixed gas is ignited and combusted on the surface of the metal fiber mesh; the combustion head 6-5 is also provided with an igniter and a flame detector for igniting and detecting the combustion state of flame and adjusting the injection ratio.
In order to ensure the full performance of heat exchange, the length of an extruded aluminum heat transfer unit 1 of the modular extruded aluminum condensing boiler is 200-3000 mm; in order to provide sufficient combustion space and avoid overhigh temperature of the fins in the combustion area, the height of the fins of the short fin area 1-10 at the inlet is controlled to be 2 mm-8 mm, and the length of the short fin area 1-10 at the inlet is 150 mm-450 mm; determining a reasonable smoke flowing cross section according to the change of the smoke temperature, further determining the height of an outer fin, determining the length of a beveling area and the height of the fin, and ensuring that the flow speed of the smoke is controlled in an economic heat exchange interval of 4-10 m/s in the whole process; the extruded aluminum heat transfer unit 1 is subjected to anodic oxidation treatment to enhance high temperature corrosion resistance.
The modular extruded aluminum condensing boiler has various combination forms; the plurality of extruded aluminum heat transfer units 1 are connected in the horizontal direction to form a primary extruded aluminum heat transfer module, and the condensing boiler comprises one or two extruded aluminum heat transfer modules; the fully premixed fire grate type combustor 6 is arranged at the bottom and is combusted upwards or arranged at the top and is combusted downwards; the flue gas of the two extruded aluminum heat transfer modules flows in the same direction or in the opposite direction; comprehensively considering the collection of condensate and the safe operation of a combustor, five combination modes are provided: when the fully premixed fire grate type combustor 6 is arranged at the bottom and comprises two extruded aluminum heat transfer modules, the fully premixed fire grate type combustor 6 is arranged at the bottom of a modularized extruded aluminum condensing boiler, a combustion head 6-5 is upward, fuel gas is ignited at the bottom, smoke gas passes through a first extruded aluminum heat transfer module 1-A from bottom to top, turns 180 degrees after entering a connecting flue 7 and then enters a second extruded aluminum heat transfer module 1-B, the smoke gas flows downwards and is condensed and cooled, the smoke gas finally enters a dew bearing plate 3, and condensate is collected by the dew bearing plate 3 at the bottom and then is discharged; when the fully premixed fire grate type burner 6 is arranged at the bottom and comprises an extruded aluminum heat transfer module, the fully premixed fire grate type burner 6 is arranged at the bottom of a boiler, a combustion head 6-5 faces upwards, fuel gas is ignited at the bottom, smoke enters the extruded aluminum heat transfer module to rise and flow to the top to be discharged, and the temperature of the water discharged by the modular extruded aluminum condensing boiler is ensured to be higher than 50 ℃; when the full-premix fire grate type burner 6 is arranged at the top and comprises an extruded aluminum heat transfer module, the full-premix fire grate type burner 6 is arranged at the top of the modularized extruded aluminum condensing boiler, a combustion head 6-5 faces downwards, the top of fuel gas is ignited, smoke flows downwards, enters the extruded aluminum heat transfer module, is cooled and condensed, and the dew bearing disc 3 is arranged below the extruded aluminum heat transfer module to collect condensate; when the full-premix fire grate type burner 6 is arranged at the top and comprises two extruded aluminum heat transfer modules, the full-premix fire grate type burner 6 is arranged at the top of a boiler, a combustion head 6-5 faces downwards, a first extruded aluminum heat transfer module 1-A is arranged below the full-premix fire grate type burner 6, a second extruded aluminum heat transfer module 1-B is arranged below the first extruded aluminum heat transfer module 1-A, the top of fuel gas is ignited, smoke flows downwards all the time, enters the first extruded aluminum heat transfer module 1-A and the second extruded aluminum heat transfer module 1-B in sequence to be cooled and condensed, a dew bearing disc 3 is arranged below the second extruded aluminum heat transfer module 1-B, and condensate is collected; when the full-premix fire grate type burner 6 is arranged at the top and comprises two extruded aluminum heat transfer modules, the full-premix fire grate type burner 6 is arranged at the top of the modularized extruded aluminum condensing boiler, a combustion head 6-5 faces downwards, fuel gas is ignited at the top, smoke gas downwards enters the first extruded aluminum heat transfer module 1-A to be cooled, turns 180 degrees after passing through a connecting flue 7 and flows upwards, enters the second extruded aluminum heat transfer module 1-B to be cooled and condensed, the smoke gas is discharged out of the boiler at the top of the second extruded aluminum heat transfer module 1-B, and condensate is collected at the bottom of the dew bearing plate 3 and discharged.
When the modular extruded aluminum condensing boiler comprises two extruded aluminum heat transfer modules, the working medium of the second-stage extruded aluminum heat transfer module adopts boiler return water, heat pump evaporator circulating water or tap water; when boiler return water is used as a working medium, the flue gas condensation amount of the second-stage extruded aluminum heat transfer module depends on the return water temperature, and the flue gas condensation amount is reduced due to overhigh return water temperature; when circulating water of the heat pump evaporator is used as a working medium, the temperature of the working medium is low and stable, the condensation amount of the flue gas is maintained at a high level, the complementary energy in the flue gas is deeply recovered, and the heat pump condenser is used for preheating boiler return water or heating tap water to obtain bathing water; when tap water is used as a working medium, the tap water is low in temperature, flue gas is deeply condensed, the residual energy of the flue gas is recovered, the tap water is heated to be above 30 ℃, the tap water is directly introduced into the extruded aluminum heat transfer unit 1, the problem of corrosion is easily caused, the tap water exchanges heat with the plate heat exchanger, the plate heat exchanger exchanges heat with the second-stage extruded aluminum heat transfer module, and the problem of corrosion caused by the fact that the tap water directly contacts the extruded aluminum is avoided.
The utility model discloses innovation point, advantage and positive effect are:
1. the utility model discloses a modularization extrusion aluminium condensation heat exchanger structure and condensing boiler structure use extrusion aluminium heat transfer unit as the main part, with aluminium bar extrusion back after the secondary operation become have from lower header, the inlet outlet, self sealss connection structure's extrusion aluminium heat transfer unit, the quantity and the quantity that change extrusion aluminium heat transfer unit can obtain the condensation heat exchanger and the condensing boiler of different power, only need one set of extrusion aluminium mould can, very big reduction design and manufacturing cost.
2. The utility model discloses a modularization extrusion aluminium condensation heat exchanger structure and condensing boiler structure, introduce the extrusion aluminium material in boiler and heat exchanger field, the cost of extrusion aluminium only has 30% of cast aluminium silicon, 60% of stainless steel, have excellent anti condensate corrosion ability after surface anodic oxidation and electrophoretic coating are handled; the length of the extruded aluminum material in the molding direction can be infinitely long, and compared with cast aluminum silicon and stainless steel materials, the extruded aluminum material has a longer heating surface, is more sufficient in heat exchange, and can realize deep condensation.
3. The utility model discloses a modular extruded aluminum condensation heat exchanger structure and a condensation boiler structure, which adopt a full premix fire grate type burner and utilize a booster fan to realize full premix combustion; according to the characteristics of the extruded aluminum boiler, the combustion head is arranged in a hearth space formed by the extruded aluminum heat transfer unit, and the center of flame is far away from the upper header and the lower header, so that supercooling boiling is avoided; the problems that the upper sealing cover plate and the lower sealing cover plate of the split type extruded aluminum boiler are easily subjected to supercooling boiling and expansion and cracking of the sealing plates caused by flame washing are solved.
4. The utility model discloses a modular extruded aluminum condensation condensing boiler structure which has a plurality of arrangement and combination modes, and can be provided with a burner at the bottom or at the top; the tail part of the condensing boiler can be connected with a condensing heat exchanger, and the condensing heat exchanger adopt different circulating working media to deeply condense smoke gas and provide domestic hot water while heating; when the arrangement space is limited, the condensing boiler can adopt a two-section combination mode, and the height of the boiler is reduced by half; all the modules are assembled in a unified way in a boiler room after being processed, and a hoisting door does not need to be reserved in the boiler room; various combination modes can meet various site requirements.
5. The utility model discloses a modularization extrusion aluminium condensation heat exchanger structure and condensing boiler structure adopt running water, heat pump evaporator circulating water as the working medium of condensation heat exchanger or condensation zone, and the working medium temperature is steerable below 20 ℃, realizes that exhaust gas temperature is less than 30 ℃ deep condensation target.
Drawings
Fig. 1 is the utility model discloses a modularization extrusion aluminium condensation heat exchanger structure sketch map.
Fig. 2 is the utility model discloses an extrusion aluminium heat transfer unit cross-sectional view of modularization extrusion aluminium condensation heat exchanger structure and condensing boiler structure, wherein: FIG. 2a is a schematic cross-sectional view of an intermediate extruded aluminum heat transfer unit; fig. 2b is a schematic cross-sectional view of the self-sealing assembly of the left and right extruded aluminum heat transfer units and the central extruded aluminum heat transfer unit.
Fig. 3 is a schematic perspective view of an extruded aluminum heat transfer unit after secondary processing is performed on a modular extruded aluminum condensing heat exchanger structure and a condensing boiler structure.
Fig. 4 is a schematic perspective view of the assembled extruded aluminum heat transfer unit of the modular extruded aluminum condensing heat exchanger structure and the condensing boiler structure of the present invention.
Fig. 5 is a schematic connection diagram of the water side and the flue gas side of the extruded aluminum heat transfer unit of the modular extruded aluminum condensing heat exchanger structure and condensing boiler structure of the present invention, wherein fig. 5a is a schematic connection diagram of the water side; fig. 5b is a schematic connection on the flue gas side.
Fig. 6 is a schematic diagram of the structure of a modular extruded aluminum condensing boiler according to the present invention.
Fig. 7 is a schematic view of an overhead fully premixed fire grate burner of a modular extruded aluminum condensing boiler structure of the present invention, wherein fig. 7a is a schematic view of a fully premixed fire grate burner; fig. 7b is a schematic view of a burner head.
Fig. 8 is an assembly schematic view of a condensing boiler of a modular extruded aluminum condensing heat exchanger structure and a condensing boiler structure according to the present invention, wherein fig. 8a is a schematic view of a bottom burner dual heat transfer module; fig. 8b is a schematic view of an overhead burner dual heat transfer module.
Fig. 9 is a schematic diagram of a water side connection of a double heat transfer module condensing boiler of a modular extruded aluminum condensing boiler structure of the present invention, wherein fig. 9a is a schematic diagram of a second stage heat transfer module using boiler return water as a working medium; FIG. 9b is a schematic diagram of a second stage heat transfer module using heat pump evaporator circulating water as a working medium and preheating boiler return water; fig. 9c is a schematic diagram of a second stage heat transfer module heating tap water through a plate heat exchanger.
Detailed Description
The following detailed description of the present invention will be made with reference to the accompanying drawings.
As shown in fig. 1, the utility model relates to a modular extruded aluminum condensation heat exchanger structure, which comprises an extruded aluminum heat transfer unit 1, an inlet divergent flue 2, a dew-bearing disc 3, an inlet header 4 and an outlet header 5; the tail part of the oil and gas boiler body is connected with an inlet divergent flue 2, boiler exhaust smoke at the temperature of 80-130 ℃ uniformly enters each extruded aluminum heat transfer unit 1 through the inlet divergent flue 2, is condensed and cooled to below 45 ℃, and enters a chimney through a dew bearing disc 3 for discharging; the inlet header 4 and the outlet header 5 are arranged on the same side of the condensing heat exchanger and are connected with all the extruded aluminum heat transfer units 1, and the cooling working medium can be circulating water of a heat pump evaporator, boiler feed water or tap water; the condensate is collected at the bottom of the dew-bearing disc 3 and is discharged through a U-shaped water-sealed pipe.
As shown in fig. 2a and 2b of fig. 2, the extruded aluminum heat transfer unit 1 comprises a middle extruded aluminum sheet and left and right extruded aluminum sheets; the middle extruded aluminum sheet consists of four parts, namely a water chamber 1-1, an outer fin 1-2, an inner fin 1-3 and a connecting part 1-4; the water chamber 1-1 consists of a plurality of middle water chamber units with the length of 2 cm-10 cm and the width of 1 cm-3 cm and two end water chamber units with the length of 1 cm-4 cm and the width of 6 cm-15 cm, the wall thickness of the water chamber 1-1 is 4 mm-8 mm, and the multi-unit water chamber structure is beneficial to enhancing the pressure resistance of the boiler; the outer fins 1-2 are arranged on the outer surfaces of the two sides of the water chamber 1-1 and are in contact with the flue gas entering from the inlet divergent flue 2 for heat exchange, the fin-to-tongue ratio is less than 5, the width of the root part is 3 mm-10 mm, the height of each fin is 5 mm-50 mm, and the surfaces of the fins are in a sawtooth shape or a wave shape so as to increase the surface area of the fins and expand the heating surface; the inner fins 1-3 are arranged on the inner side of the water chamber 1-1, the fin-to-tongue ratio is less than 5, the root width is 2 mm-5 mm, the fin height is 4 mm-14 mm, and the surfaces of the fins are in sawtooth or wave shapes so as to increase the surface area of the fins and expand the heating surface; the connecting parts 1-4 are positioned on the short sides of the two sides of the water chamber units at the two ends and play a role in connecting the two adjacent extruded aluminum heat transfer units 1 and sealing the flue gas; the left and right extruded aluminum sheets also consist of four parts, namely a water chamber 1-1, an outer fin 1-2, an inner fin 1-3 and a connecting part 1-4, wherein the outer fin 1-2 and the connecting part 1-4 are only arranged on the smoke side of the water chamber 1-1, and the outer fin 1-2 and the connecting part 1-4 are not arranged on the air side of the water chamber 1-1.
As shown in fig. 3, the extruded aluminum heat transfer unit 1 is subjected to secondary processing after being extruded by an extruder; cutting circular inlets 1-5 and circular outlets 1-6 with the diameter of 20-60 mm on the long side wall surfaces of the water chamber units at the two ends; screw holes are processed on the upper end surface and the lower end surface of the extruded aluminum heat transfer unit 1 and are used for fixing an upper sealing cover plate and a lower sealing cover plate; cutting off the wall surface of the water side channel 20-60 mm away from the upper end and the lower end of the water chamber 1-1 and the inner fins 1-3 to form a communicated water chamber space 1-8 with the height of 20-60 mm, and using the communicated water chamber space as an upper header and a lower header of a plurality of water side channels; cutting off the part of the outer fin 1-2 with the distance of 50-300 mm from the flue gas inlet, and reserving the root of the fin with the height of 2-5 mm to form a low fin area 1-10 of the inlet; a transition area 1-9 with the length of more than 100mm is obliquely cut between the short fin area 1-10 and the normal outer fin 1-2, the flow cross section of the flue gas is changed by changing the height of the outer fin, the flow velocity of the flue gas is controlled, and the over-high flow velocity of the flue gas at the inlet section is avoided; the surface of the extruded aluminum heat transfer unit 1 is subjected to anodic oxidation and electrophoretic coating treatment to enhance the condensate corrosion resistance.
As shown in fig. 4, the extruded aluminum heat transfer unit 1 is assembled with hexagon socket head cap screws 1-11, sealing cover plates 1-12, flow equalizing plates 1-13 and flow cores 1-14 after secondary processing; the inner hexagonal screws 1-11 are used for fixing the sealing cover plates 1-12; the sealing cover plate 1-12 is provided with a countersunk hole, the side close to the end part of the extruded aluminum is provided with a sealing groove, a silica gel sealing ring is arranged in the sealing groove, the upper end and the lower end of the extruded aluminum heat transfer unit 1 are sealed, the flow equalizing plate 1-13 is arranged between the communicated water chamber space 1-8 and the water chamber 1-1, and the water flow of each water chamber 1-1 is uniformly distributed by utilizing the resistance of the small hole; the flow core 1-14 is fixed by the flow equalizing plates 1-13 at the upper and lower sides, is composed of a plurality of cylinders or spiral cylinders penetrating through the water chambers 1-1, and is used for disturbing the flow of water at the water side, reducing the flow cross section of each water chamber 1-1, improving the flow velocity of the water side and strengthening the heat exchange at the water side. The cooling working medium enters the communicated water chamber spaces 1-8 at the lower part of the extruded aluminum heat transfer unit 1 through the circular inlets 1-5 at the lower part, enters each water chamber 1-1 through the lower parts of the flow equalizing plates 1-13 at the lower part, then leaves the water chamber 1-1 from the upper part of the flow equalizing plate 1-13 at the upper part, enters the communicated water chamber spaces 1-8 at the upper part, and leaves the extruded aluminum heat transfer unit 1 from the circular outlets 1-6.
As shown in fig. 5, in order to ensure the sealing and connection of the flue gas side and the water side of the modular extruded aluminum condensing heat exchanger and the condensing boiler, an inlet header 4 and an outlet header 5 are arranged at the outer sides of all the extruded aluminum heat transfer units 1 and are connected with all the extruded aluminum heat transfer units 1 through flexible connection; the thickness of the extruded aluminum wall is only 4 mm-8 mm, a threaded hole is directly tapped on the wall surface, and the extruded aluminum wall is easy to slip and leak, as shown in fig. 5a and 5b, an internal external thread joint 4-1, an external internal thread movable joint 4-2 and a silica gel sealing ring 4-3 are adopted to connect an extruded aluminum heat transfer unit 1 with a header, so that a complete water path is formed; the built-in external screw joint 4-1 is arranged in the water chamber units at two ends of the water chamber 1-1, the built-in external screw joint 4-1 extends out of the water chamber 1-1 through the round inlet 1-5 and the round outlet 1-6 to be connected with the external internal screw movable joint 4-2, and the silica gel sealing ring 4-3 is positioned between the circular ring fixing base of the built-in external screw joint 4-1 and the inner wall surface of the water chamber 1-1; as shown in fig. 5c, the extruded aluminum heat transfer unit 1 is connected with the inlet divergent flue 2 and the dew containing tray 3 through flange bolts, semicircular bolt holes are reserved in the sealing cover plates 1-12 at the two ends of the extruded aluminum heat transfer unit 1, the semicircular bolt holes between the two sealing cover plates form complete bolt holes, the bolt holes are in one-to-one correspondence with the bolt holes on the connecting flanges of the divergent flue 2 and the dew containing tray 3, a sealing gasket is added in the middle, and the bolt holes are connected.
As shown in fig. 6, the utility model discloses modularization extrusion aluminium condensing boiler structure includes: the system comprises an extruded aluminum heat transfer unit 1, a dew bearing disc 3, an inlet header 4, an outlet header 5 and a full-premix fire grate type combustor 6; the uniformly mixed gas and air are ignited and combusted in a hearth space formed by the extruded aluminum heat transfer unit 1, the smoke is cooled and condensed to below 45 ℃ in the downward flowing process, and enters a chimney through a dew bearing disc 3 to be discharged; the inlet header 4 and the outlet header 5 are connected with all the extruded aluminum heat transfer units 1; the condensate is collected at the bottom of the dew-bearing disc 3 and is discharged through a U-shaped water-sealed pipe.
As shown in fig. 7a of fig. 7, the fully premixed fire grate type combustor 6 is composed of a pressurized air cover 6-1, an isobaric gas distribution chamber 6-2, an ejector 6-3, a gas mixing cavity 6-4 and a combustion head 6-5; the flange plate at the upper end of the booster fan cover 6-1 is connected with a booster fan, the internal air pressure is slightly greater than the atmospheric pressure, the injection capacity of the injector 6-3 is enhanced, and the excess air coefficient is larger than 1.1; the isobaric gas distribution chamber 6-2 adopts an isobaric air channel design to ensure that each nozzle distributes equal amount of gas; the ejector 6-3 is arranged below the isobaric gas distribution chamber 6-2; injecting air by the fuel gas, then feeding the air into a gas mixing cavity 6-4, and uniformly mixing the fuel gas and the air; the combustion head 6-5 is communicated with the bottom of the gas mixing cavity 6-4 and distributed among the extruded aluminum heat transfer units 1, and the mixed gas enters the combustion head 6-5 after leaving the gas mixing cavity 6-4 and is combusted in a hearth space formed by the extruded aluminum heat transfer units 1. The combustion head 6-5 extends into a hearth space formed by the inlet short fin regions 1-10, as shown in fig. 7b, the bottom 6-5-1 of the combustion head is fixed on a sealing cover plate 1-12 of the extruded aluminum heat transfer unit 1, the middle part 6-5-2 of the combustion head is in an isosceles trapezoid shape, and the head 6-5-4 of the combustion head is in a semicircular shape; the height of the middle part 6-5-2 of the combustion head is 50 mm-150 mm, triangular openings 6-5-3 are processed on the wall surface of the isosceles trapezoid section, and a negative pressure area formed by high-speed airflow in the combustion head 6-5 is used for ejecting positive pressure smoke in a hearth, so that combustion is delayed, a flame high-temperature area is weakened, and the generation of thermal nitrogen oxides is reduced; circular openings with the diameter of 2 mm-5 mm are uniformly distributed on the head part 6-5-4 of the combustion head for equalizing the flow of mixed gas and preventing tempering, and the combustion area of the semicircular head part 6-5-4 of the combustion head is increased by 50 percent compared with that of a flat head part; a layer of metal fiber mesh is wrapped outside the head part 6-5-4 of the combustion head, and the mixed gas is ignited and combusted on the surface of the metal fiber mesh; the combustion head 6-5 is also provided with an igniter and a flame detector for igniting and detecting the combustion state of flame and adjusting the injection ratio.
In order to ensure the full performance of heat exchange, the length of the extruded aluminum heat transfer unit 1 of the modularized extruded aluminum condensing boiler structure is 200-3000 mm; in order to provide sufficient combustion space and avoid overhigh temperature of the fins in the combustion area, the height of the fins of the short fin area 1-10 at the inlet is controlled to be 2 mm-8 mm, and the length of the short fin area 1-10 at the inlet is 150 mm-450 mm; determining a reasonable smoke flowing cross section according to the change of the smoke temperature, further determining the height of an outer fin, determining the length of a beveling area and the height of the fin, and ensuring that the flow speed of the smoke is controlled in an economic heat exchange interval of 4-10 m/s in the whole process; the extruded aluminum heat transfer unit 1 is subjected to anodic oxidation treatment to enhance high temperature corrosion resistance.
The modular extruded aluminum condensing boiler structure has various combination forms; the plurality of extruded aluminum heat transfer units 1 are connected in the horizontal direction to form a primary extruded aluminum heat transfer module, and the condensing boiler comprises one or two extruded aluminum heat transfer modules; the fully premixed fire grate type combustor 6 is arranged at the bottom and is combusted upwards or arranged at the top and is combusted downwards; the flue gas of the two extruded aluminum heat transfer modules flows in the same direction or in the opposite direction; comprehensively considering the collection of condensate and the safe operation of a combustor, five combination modes are provided: as shown in fig. 8a of fig. 8, when the fully premixed fire grate type burner 6 is arranged at the bottom and comprises two extruded aluminum heat transfer modules, the fully premixed fire grate type burner 6 is arranged at the bottom of the modular extruded aluminum condensing boiler, a combustion head 6-5 is upward, fuel gas is ignited at the bottom, the flue gas passes through a first extruded aluminum heat transfer module 1-a from bottom to top, enters a connecting flue 7 and turns 180 degrees to enter a second extruded aluminum heat transfer module 1-B from bottom to bottom, the flue gas flows downwards and is condensed to cool, the flue gas finally enters a bearing and exposing disc 3, condensate is collected by the bearing and exposing disc 3 at the bottom and then is discharged, boiler return water firstly enters an inlet collection box of the second extruded aluminum heat transfer module 1-B, leaves from an outlet collection box, then enters an inlet collection box of the first extruded aluminum heat transfer module 1-a, and leaves from the outlet collection box; as shown in fig. 8B of fig. 8, when the fully premixed fire grate type burner 6 is arranged on top and comprises two extruded aluminum heat transfer modules, the fully premixed fire grate type burner 6 is arranged at the top of the boiler, a combustion head 6-5 faces downwards, a first extruded aluminum heat transfer module 1-a is arranged below the fully premixed fire grate type burner 6, a second extruded aluminum heat transfer module 1-B is arranged below the first extruded aluminum heat transfer module 1-a, the top of the fuel gas is ignited, the flue gas flows downwards all the time and enters the first extruded aluminum heat transfer module 1-a and the second extruded aluminum heat transfer module 1-B to be cooled and condensed, a dew bearing disc 3 is arranged below the second extruded aluminum heat transfer module 1-B to collect condensate; (ii) a Boiler backwater firstly enters an inlet header of the second extruded aluminum heat transfer module 1-B, leaves from an outlet header, then enters an inlet header of the first extruded aluminum heat transfer module 1-A, leaves from the outlet header, and condensate is collected by a dew-bearing disc 3 at the bottom and then is discharged. When the fully premixed fire grate type burner 6 is arranged at the bottom and comprises an extruded aluminum heat transfer module, the fully premixed fire grate type burner 6 is arranged at the bottom of the boiler, a combustion head 6-5 faces upwards, fuel gas is ignited at the bottom, smoke enters the extruded aluminum heat transfer module to rise and flow to the top to be discharged, and the temperature of the water discharged by the modularized extruded aluminum condensing boiler is ensured to be higher than 50 ℃. When the full-premix fire grate type burner 6 is arranged on top and comprises an extruded aluminum heat transfer module, the full-premix fire grate type burner 6 is arranged at the top of a modular extruded aluminum condensing boiler, a combustion head 6-5 faces downwards, the top of gas is ignited, smoke flows downwards, enters the extruded aluminum heat transfer module, is cooled and condensed, a dew bearing disc 3 is arranged below the extruded aluminum heat transfer module, condensate is collected, when the full-premix fire grate type burner 6 is arranged on top and comprises two extruded aluminum heat transfer modules, the full-premix fire grate type burner 6 is arranged at the top of the modular extruded aluminum condensing boiler, the combustion head 6-5 faces downwards, the gas is ignited at the top, the smoke flows downwards into a first extruded aluminum heat transfer module 1-A to be cooled, turns upwards at 180 degrees after being connected with a flue 7, enters a second extruded aluminum heat transfer module 1-B to be cooled and condensed, and is discharged from the top boiler of the second extruded aluminum heat transfer module 1-B, the condensate is collected at the bottom of the dew-bearing plate 3 and discharged.
As shown in fig. 9, when the extruded aluminum heat transfer units 1 in the extruded aluminum modular condensing boiler structure are arranged in two stages, the working medium of the second-stage extruded aluminum heat transfer module can adopt boiler return water, heat pump evaporator circulating water, tap water and the like; as shown in fig. 9a, when boiler return water is used as a working medium, the boiler return water firstly enters the inlet header of the second-stage extruded aluminum heat transfer module, leaves from the outlet header and then enters the inlet header of the first-stage extruded aluminum heat transfer module, and leaves from the outlet header and supplies heat to the outside; as shown in fig. 9b, when the circulating water of the heat pump evaporator is used as a working medium, the boiler return water firstly enters the heat pump condenser for preheating, then enters the inlet header of the first-stage extruded aluminum heat transfer module, leaves from the outlet header and supplies heat to the outside; as shown in fig. 9c, when the second stage extruded aluminum heat transfer module is used to heat tap water, the tap water is indirectly heated by the plate heat exchanger, avoiding the corrosion and scaling problems caused by directly heating tap water.
Claims (10)
1. A modularization extrusion aluminium condensation heat exchanger structure which characterized in that: comprises an extruded aluminum heat transfer unit (1), an inlet divergent flue (2), a dew bearing disc (3), an inlet header (4) and an outlet header (5); the inlet divergent flue (2) is positioned at the top of the extruded aluminum heat transfer unit (1), the dew bearing disc (3) is positioned at the bottom of the extruded aluminum heat transfer unit (1), the inlet header (4) and the outlet header (5) are arranged at the same side of the condensing heat exchanger and are connected with all the extruded aluminum heat transfer units (1), and the cooling working medium is heat pump evaporator circulating water, boiler feed water or tap water; the condensate is collected at the bottom of the dew-bearing disc (3) and is discharged through a U-shaped water-sealed pipe.
2. A modular extruded aluminum condensing heat exchanger structure according to claim 1 wherein: the extruded aluminum heat transfer unit (1) comprises a middle extruded aluminum sheet and a left extruded aluminum sheet and a right extruded aluminum sheet; the middle extruded aluminum sheet consists of four parts, namely a water chamber (1-1), an outer fin (1-2), an inner fin (1-3) and a connecting part (1-4); the water chamber (1-1) consists of a plurality of middle water chamber units with the length of 2 cm-10 cm and the width of 1 cm-3 cm and two end water chamber units with the length of 1 cm-4 cm and the width of 6 cm-15 cm, the wall thickness of the water chamber (1-1) is 4 mm-8 mm, and the multi-unit water chamber structure is beneficial to enhancing the pressure resistance of the boiler; the outer fins (1-2) are arranged on the outer surfaces of the two sides of the water chamber (1-1) and are in contact with the flue gas entering from the inlet divergent flue (2) for heat exchange, the fin-to-tongue ratio is less than 5, the root width is 3 mm-10 mm, the fin height is 5 mm-50 mm, and the surfaces of the fins are in a sawtooth or wave shape so as to increase the surface area of the fins and expand the heating surface; the inner fins (1-3) are arranged on the inner side of the water chamber (1-1), the tongue ratio of the fins is less than 5, the width of the root part is 2-5 mm, the height of the fins is 4-14 mm, and the surfaces of the fins are in a sawtooth or wave shape so as to increase the surface area of the fins and expand the heating surface; the connecting parts (1-4) are positioned on the short sides of the two sides of the water chamber units at the two ends and play a role in connecting the two adjacent extruded aluminum heat transfer units (1) and sealing the flue gas; the left and right extruded aluminum sheets also consist of four parts, namely a water chamber (1-1), outer fins (1-2), inner fins (1-3) and connecting parts (1-4), wherein the outer fins (1-2) and the connecting parts (1-4) are only arranged on the smoke side of the water chamber (1-1), and the outer fins (1-2) and the connecting parts (1-4) are not arranged on the air side of the water chamber (1-1).
3. A modular extruded aluminum condensing heat exchanger structure according to claim 2 wherein: the extruded aluminum heat transfer unit (1) is subjected to secondary processing after being extruded and formed by an extruder; cutting a circular inlet (1-5) and a circular outlet (1-6) with the diameter of 20-60 mm on the long side wall surface of the water chamber units at the two ends; screw holes are processed on the upper end surface and the lower end surface of the extruded aluminum heat transfer unit (1) and are used for fixing an upper sealing cover plate and a lower sealing cover plate; cutting off the wall surface of the water side channel and the inner fins (1-3) which are 20-60 mm away from the upper end and the lower end of the water chamber (1-1) to form a communicated water chamber space (1-8) with the height of 20-60 mm, and using the communicated water chamber space as an upper header and a lower header of a plurality of water side channels; cutting off the part of an outer fin (1-2) 50-300 mm away from the flue gas inlet, and reserving the root of a fin 2-5 mm high to form a short fin area (1-10) of the inlet; a transition area (1-9) with the length of more than 100mm is obliquely cut between the short fin area (1-10) and the normal outer fin (1-2), the flow cross section of the flue gas is changed by changing the height of the outer fin, the flow velocity of the flue gas is controlled, and the over-high flow velocity of the flue gas at the inlet section is avoided; the surface of the extruded aluminum heat transfer unit (1) is subjected to anodic oxidation and electrophoretic coating treatment to enhance the condensate corrosion resistance.
4. A modular extruded aluminum condensing heat exchanger structure according to claim 3 wherein: the extruded aluminum heat transfer unit (1) is assembled with the inner hexagonal screws (1-11), the sealing cover plates (1-12), the flow equalizing plates (1-13) and the flow cores (1-14) after secondary processing; the inner hexagonal screw (1-11) is used for fixing the sealing cover plate (1-12); the sealing cover plate (1-12) is provided with a counter bore, the side close to the end part of the extruded aluminum heat transfer unit (1) is provided with a sealing groove, a silica gel sealing ring is arranged in the sealing groove, and the upper end and the lower end of the extruded aluminum heat transfer unit (1) are sealed; the flow equalizing plates (1-13) are arranged between the communicated water chamber spaces (1-8) and the water chambers (1-1), and the water flow of each water chamber (1-1) is uniformly distributed by utilizing the resistance of the small holes; the flow core (1-14) is fixed by the flow equalizing plates (1-13) at the upper side and the lower side and consists of a plurality of cylinders or spiral cylinders which penetrate through the water chamber (1-1).
5. A modular extruded aluminum condensing heat exchanger structure according to claim 1 wherein: the extruded aluminum heat transfer units (1) are connected with the inlet header (4) and the outlet header (5) in a flexible connection mode, and the inlet header (4) and the outlet header (5) are arranged on the outer sides of all the extruded aluminum heat transfer units (1) and are connected with all the extruded aluminum heat transfer units (1); the thickness of the extruded aluminum wall is only 4 mm-8 mm, a threaded hole is directly tapped on the wall surface, the extruded aluminum wall is easy to slip and leak, and the inlet header (4) and the outlet header (5) are connected with the extruded aluminum heat transfer unit (1) by adopting an internal external thread joint (4-1), an external internal thread movable joint (4-2) and a silica gel sealing ring (4-3); the built-in external thread joint (4-1) is arranged in the water chamber units at two ends of the water chamber (1-1), the built-in external thread joint (4-1) extends out of the water chamber (1-1) through the circular inlet (1-5) and the circular outlet (1-6) to be connected with the external internal thread movable joint (4-2), and the silica gel sealing ring (4-3) is positioned between the circular ring fixing base of the built-in external thread joint (4-1) and the inner wall surface of the water chamber (1-1); the extruded aluminum heat transfer unit (1) is connected with the inlet gradually-expanding flue (2) and the dew-bearing disc (3) through flange bolts, semicircular bolt holes are reserved in sealing cover plates (1-12) at two ends of the extruded aluminum heat transfer unit (1), the semicircular bolt holes between the two sealing cover plates form complete bolt holes, the bolt holes are in one-to-one correspondence with the bolt holes in the gradually-expanding flue (2) and the dew-bearing disc (3) connecting flange, and a sealing gasket is added in the middle of the bolt holes for connection.
6. The utility model provides a modularization extrusion aluminium condensing boiler structure which characterized in that: the system comprises an extruded aluminum heat transfer unit (1), a full-premix fire grate type combustor (6), a dew bearing disc (3), an inlet header (4), an outlet header (5) and a connecting flue (7); the modularized extruded aluminum condensing boiler is characterized in that an inlet gradually-expanded flue (2) is replaced by a full-premix fire-row type burner (6) on the basis of the modularized extruded aluminum condensing heat exchanger to form a single condensing boiler, an extruded aluminum heat transfer unit (1) is lengthened, part of outer fins of a flame area of the burner are cut off, and other components are unchanged; the full-premixing fire grate type combustor (6) consists of a pressurizing fan cover (6-1), an isobaric gas distribution chamber (6-2), an ejector (6-3), a gas mixing cavity (6-4) and a combustion head (6-5); the flange plate at the upper end of the booster fan cover (6-1) is connected with the booster fan, the internal air pressure is greater than the atmospheric pressure, the ejection capacity of the ejector (6-3) is enhanced, and the excess air coefficient is greater than 1.1; the isobaric gas distribution chamber (6-2) is arranged below the supercharging fan cover (6-1), and the isobaric air channel design is adopted to ensure that each nozzle on the isobaric gas distribution chamber distributes equal amount of gas; the ejector (6-3) is arranged below each nozzle of the isobaric gas distribution chamber (6-2); the gas mixing cavity (6-4) is arranged below the ejector (6-3), the gas mixing cavity (6-4) is communicated with the isobaric gas distribution chamber (6-2) through a plurality of ejectors (6-3) and a plurality of nozzles on the isobaric gas distribution chamber (6-2), the gas injects air and then enters the gas mixing cavity (6-4), and the gas and the air are uniformly mixed; the combustion head (6-5) is communicated with the bottom of the gas mixing cavity (6-4) and distributed among the extruded aluminum heat transfer units (1), and the mixed gas leaves the gas mixing cavity (6-4) and then enters the combustion head (6-5) for combustion.
7. A modular extruded aluminum condensing boiler structure according to claim 6, characterized in that: the combustion head (6-5) extends into a hearth space formed by the inlet short-fin regions (1-10), the bottom (6-5-1) of the combustion head is fixed on a sealing cover plate (1-12) of the extruded aluminum heat transfer unit (1), the middle part (6-5-2) of the combustion head is in an isosceles trapezoid shape, and the head (6-5-4) of the combustion head is in a semicircular shape; the height of the middle part (6-5-2) of the combustion head is 50 mm-150 mm, and triangular openings (6-5-3) are processed on the wall surface of the isosceles trapezoid section; circular openings with the diameter of 2 mm-5 mm are uniformly distributed on the head part (6-5-4) of the combustion head for equalizing the flow of mixed gas and preventing tempering, and the combustion area of the semicircular head part of the head part (6-5-4) of the combustion head is increased by 50 percent compared with that of a flat head part; a layer of metal fiber mesh is wrapped outside the head part (6-5-4) of the combustion head, and the mixed gas is ignited and combusted on the surface of the metal fiber mesh; the combustion head (6-5) is also provided with an igniter and a flame detector for igniting and detecting the combustion state of flame and adjusting the injection ratio.
8. A modular extruded aluminum condensing boiler structure according to claim 6, characterized in that: in order to ensure the full performance of heat exchange, the length of the extruded aluminum heat transfer unit (1) of the modular extruded aluminum condensing boiler is 200-3000 mm; in order to provide sufficient combustion space and avoid overhigh temperature of the fins in the combustion area, the height of the fins of the short fin area (1-10) at the inlet is controlled to be 2-8 mm, and the length of the short fin area (1-10) at the inlet is 150-450 mm.
9. A modular extruded aluminum condensing boiler structure according to claim 6, characterized in that: the modular extruded aluminum condensing boiler has various combination forms; the plurality of extruded aluminum heat transfer units (1) are connected in the horizontal direction to form a primary extruded aluminum heat transfer module, and the condensing boiler comprises one or two extruded aluminum heat transfer modules; the full-premixing fire grate type combustor (6) is arranged at the bottom and is combusted upwards or arranged at the top and is combusted downwards; the flue gas of the two extruded aluminum heat transfer modules flows in the same direction or in the opposite direction; comprehensively considering the collection of condensate and the safe operation of a combustor, five combination modes are provided: when the fully-premixed fire grate type combustor (6) is arranged at the bottom and comprises two extruded aluminum heat transfer modules, the fully-premixed fire grate type combustor (6) is arranged at the bottom of the modular extruded aluminum condensing boiler, a combustion head (6-5) faces upwards, a first extruded aluminum heat transfer module (1-A) is arranged at the top of the fully-premixed fire grate type combustor (6), the top of the first extruded aluminum heat transfer module (1-A) is communicated with the top of a second extruded aluminum heat transfer module (1-B) through a connecting flue (7), and the bottom of the second extruded aluminum heat transfer module (1-B) is communicated with a dew-bearing disc (3); when the fully premixed fire grate type combustor (6) is arranged at the bottom and comprises an extruded aluminum heat transfer module, the fully premixed fire grate type combustor (6) is arranged at the bottom of a boiler, a combustion head (6-5) is upward, the extruded aluminum heat transfer module is arranged at the top of the fully premixed fire grate type combustor (6), smoke is discharged from the top of the extruded aluminum heat transfer module, and a dew bearing disc (3) is not arranged; when the full-premix fire grate type burner (6) is arranged at the top and comprises an extruded aluminum heat transfer module, the full-premix fire grate type burner (6) is arranged at the top of the modularized extruded aluminum condensing boiler, a combustion head (6-5) faces downwards, the extruded aluminum heat transfer module is arranged at the bottom of the full-premix fire grate type burner (6), the dew bearing disc (3) is arranged below the extruded aluminum heat transfer module, the top of fuel gas is ignited, flue gas flows downwards, enters the extruded aluminum heat transfer module, is cooled and condensed, and condensate is collected by the dew bearing disc (3); when the fully-premixed fire grate type combustor (6) is arranged at the top and comprises two extruded aluminum heat transfer modules, the fully-premixed fire grate type combustor (6) is arranged at the top of a boiler, a combustion head (6-5) faces downwards, a first extruded aluminum heat transfer module (1-A) is arranged below the fully-premixed fire grate type combustor (6), a second extruded aluminum heat transfer module (1-B) is arranged below the first extruded aluminum heat transfer module (1-A), a dew bearing disc (3) is arranged below the second extruded aluminum heat transfer module (1-B), the top of fuel gas is ignited, smoke flows downwards all the time and enters the first extruded aluminum heat transfer module (1-A) and the second extruded aluminum heat transfer module (1-B) in sequence to be cooled and condensed, and the dew bearing disc (3) collects condensate; when the fully premixed fire grate type burner (6) is arranged at the top and comprises two extruded aluminum heat transfer modules, the fully premixed fire grate type burner (6) is arranged at the top of the modularized extruded aluminum condensing boiler, a combustion head (6-5) faces downwards, the first extruded aluminum heat transfer module (1-A) is arranged at the bottom of the fully premixed fire grate type burner (6), the bottom of the first extruded aluminum heat transfer module (1-A) is communicated with the bottom of the second extruded aluminum heat transfer module (1-B) through a connecting flue (7), fuel gas is ignited at the top, the flue gas enters the first extruded aluminum heat transfer module (1-A) downwards to be cooled, turns 180 degrees after passing through the connecting flue (7) and flows upwards, enters the second extruded aluminum heat transfer module (1-B) to be cooled and condensed, and is discharged out of the boiler at the top of the second extruded aluminum heat transfer module (1-B), the condensate is collected at the bottom of the connecting flue (7) and discharged.
10. A modular extruded aluminum condensing boiler structure according to claim 9, characterized in that: when the modular extruded aluminum condensing boiler comprises two extruded aluminum heat transfer modules, the working medium of the second-stage extruded aluminum heat transfer module adopts boiler return water, heat pump evaporator circulating water or tap water.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110006174A (en) * | 2019-03-21 | 2019-07-12 | 西安交通大学 | A kind of modularization extruded aluminium condensing heat exchanger and condenser boiler |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110006174A (en) * | 2019-03-21 | 2019-07-12 | 西安交通大学 | A kind of modularization extruded aluminium condensing heat exchanger and condenser boiler |
| CN110006174B (en) * | 2019-03-21 | 2023-12-19 | 西安交通大学 | Modularized extruded aluminum condensation heat exchanger and condensation type boiler |
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