CN209944755U - A modular extruded aluminum condensing heat exchanger structure and condensing boiler structure - Google Patents

Abstract

The utility model discloses a modular extruded aluminum condensing heat exchanger structure and a condensing boiler structure. According to the relative arrangement of a burner and an extruded aluminum condensing heat exchanger, a single, left and right or upper and lower split condensing boiler is formed. It consists of extruded aluminum heat transfer unit, inlet gradually expanding flue, dew tray, inlet header, outlet header, full premixed fire row burner, etc.; The extruded aluminum heat transfer unit with complete water channel is combined into the main part of the condensing heat exchanger or the condensing boiler; the combustion head of the fully premixed fire row burner penetrates deep between the extruded aluminum heat transfer units to avoid sealing the cover plate Deformation and leakage caused by flame erosion; extruded aluminum material has the advantages of high tensile strength, low density and corrosion resistance, and the cost is only 30% of cast aluminum silicon and 60% of stainless steel; The surplus design improves the boiler efficiency by more than 6%, saves energy and gas, and alleviates the current situation of natural gas shortage.

Description

A modular extruded aluminum condensing heat exchanger structure and condensing boiler structure

technical field

The utility model relates to the technical field of oil-fired gas boilers and flue gas waste heat recovery, in particular to a modular condensing gas boiler structure using extruded aluminum as a material and a modular condensing heat exchanger structure for recovering latent heat in the tail gas of the oil-fired gas boiler.

Background technique

In recent years, the problem of smog has persisted, and after entering the heating season, smog has become more frequent. In order to control the smog and protect the blue sky, the heating industry proposed the "Winter Clean Heating Plan in the Northern Region 2017-2021", which requires a clean heating rate of 70% by 2021, and clean energy to replace heating with 150 million tons of scattered coal. In the winter of 2016, the natural gas consumption for heating reached 36.3 billion m ³ . It is expected that the heating gas consumption will reach more than 64 billion m ³ by 2021. The rapid development of commercial gas heating boilers has created a huge gap in the supply of natural gas. By 2021, only natural gas will be used for heating. One has a new supply gap of more than 30 billion ^m3 . In 2017, China's natural gas consumption was 237.4 billion m ³ , natural gas production was 153.6 billion m ³ , and natural gas imports were 83.8 billion m ³ ; it is estimated that by 2021, natural gas production will rise to 185.6 billion m ³ , imports will exceed 100 billion m ³ , and natural gas increments will be 48.2 billion. m ³ . However, at present, my country's natural gas is given priority to ensure urban supply, followed by industrial demand. The newly added natural gas supply can only meet the growing urban gas supply demand, and the huge gap of natural gas for heating still cannot be met.

To solve the huge gap of heating natural gas, on the one hand, it is open source, and on the other hand, it is throttling. Throttling requires increasing the efficiency of natural gas boilers to conserve natural gas. The current central heating natural gas boiler can realize the condensation of flue gas only when the return water temperature is low (below 58 ℃), and utilize the latent heat of water vapor in the flue gas. When used for radiator heating, the temperature of the return water is generally above 60 °C, and the condensation of flue gas cannot be achieved by relying on the return water of the boiler, resulting in a huge waste of latent heat of water vapor in the exhaust. For a 700kW gas-fired boiler, the exhaust gas temperature is reduced from 80°C to 35°C, 70kW of heat can be recovered, the boiler efficiency is increased to 108%, and natural gas is saved by more than 12%. At present, the steel boilers on the market are equipped with condensers and economizers, but the high return water temperature makes it difficult for the condensers to function. At the same time, in order to save costs, the condensers are mostly made of ND steel materials, which are easily corroded and leaked by condensed water. .

my country's economy continues to develop rapidly, the consumption of fossil energy is increasing year by year, the air quality is also deteriorating, and smog is raging all over the country. The relative humidity of haze in the heating season is above 80%. The high humidity environment is a prerequisite for the occurrence of haze, which provides an excellent reaction hotbed for various secondary pollutants in the air. The extensive use of fossil fuels has released a huge amount of water vapor into the atmosphere, making the otherwise dry winter humid, creating favorable conditions for smog. Therefore, to control smog, we must first reduce humidity. The oil-fired gas heating unit emits a huge amount of wet steam into the atmosphere. A condensing heat exchanger is installed at the end of the oil-fired gas boiler to recover the latent heat of vaporization, remove water vapor, reduce the humidity of exhaust smoke, and achieve the goal of controlling haze and protecting the blue sky.

At present, there is an urgent need on the market for a condensing heat exchanger that can truly achieve condensation, corrosion resistance, low cost, good heat exchange, and compact size. It can improve boiler efficiency while reducing water vapor emissions, taking into account environmental protection and economic benefits. The current condensing heat exchanger materials include stainless steel, cast aluminum silicon, copper alloy, etc., but stainless steel has low thermal conductivity, high cost of cast aluminum silicon, and poor corrosion resistance of copper alloy. The alloy is equivalent and has excellent corrosion resistance, which is the best choice for condensing heat exchangers. At present, the commonly used 6063 series extruded aluminum alloy has a tensile strength of more than 150MPa. After anodizing and surface electrophoresis coating, it can be used for a long time in an environment of pH 1, and has good acid and salt resistance. The use of extruded aluminum materials for condensing heat exchangers has huge advantages compared with traditional materials, but there is currently no extruded aluminum condensing heat exchangers on the market, and there is a lack of relevant design standards. This patent will take the extruded aluminum profile as the unit component of the heat exchanger, and add the enhanced heat transfer structure and the inlet and outlet connection components to design an extruded aluminum condensing heat exchanger that can be mass-produced.

Adding a burner to the head of the extruded aluminum condensing heat exchanger and cutting off part of the outer fins to increase the furnace space can be used as a condensing boiler. Using extruded aluminum materials to make condensing boilers, compared with traditional cast aluminum-silicon and stainless steel condensing boilers, the cost can be reduced by more than 30%. The integrated extruded aluminum boiler requires the burner to be installed between the extruded aluminum heat exchange units. The space is small, but it has a high combustion heat load; to meet the requirements of low-nitrogen combustion, the built-in flue gas recirculation and reasonable air distribution are used. Or water-cooled flame and other principles to reduce the flame temperature in the combustion zone. The current full-premixed low-nitrogen burners mostly use panel or cylindrical combustion heads, which cannot meet the burner requirements of an integrated extruded aluminum boiler; the atmospheric burner adopts a fire row structure to meet the space requirements, but the combustion heat intensity is relatively high. low, the boiler power is low. This patent will design a fire exhaust type full premix burner, the combustion head is placed between the extruded aluminum heat exchange units, to achieve higher combustion heat load and low nitrogen combustion.

SUMMARY OF THE INVENTION

In order to reduce the cost of the flue gas condensing heat exchanger and promote the development of the waste heat recovery technology of the fuel gas boiler flue gas, the purpose of this utility model is to provide a modular extruded aluminum condensing heat exchanger and an integrated extruded aluminum condensing boiler The utility model solves the problems that the flue gas condensing heat exchanger is easy to corrode, high in cost, and occupies a large area. Water vapor promotes the development of low-temperature waste heat recovery and flue gas whitening technology for oil-fired gas boilers, and contributes to alleviating and eliminating smog; introducing extruded aluminum materials into the condensing boiler system, and designing a fully premixed fire row burner , install a burner at the head of the condensing heat exchanger, and cut some fins, which solves the problems of high cost and slow promotion of condensing boilers, improves the utilization rate of natural gas, and contributes to alleviating the current situation of natural gas shortage.

In order to achieve the above purpose, the utility model adopts the following technical solutions:

A modular extruded aluminum condensing heat exchanger structure includes an extruded aluminum heat transfer unit 1, an inlet gradually expanding flue 2, a dew receiving tray 3, an inlet header 4 and an outlet header 5; the inlet gradually expanding smoke Channel 2 is located at the top of the extruded aluminum heat transfer unit 1, the dew receiving tray 3 is located at the bottom of the extruded aluminum heat transfer unit 1, and the inlet header 4 and the outlet header 5 are placed on the same side of the condensing heat exchanger, which are connected to all the extruded aluminum heat transfer units. The heat unit 1 is connected, and the cooling medium selects the circulating water of the heat pump evaporator, the boiler feed water or the tap water; the condensate is collected at the bottom of the dew tray 3 and discharged through the U-shaped water seal pipe.

The extruded aluminum heat transfer unit 1 includes a middle extruded aluminum sheet and left and right extruded aluminum sheets; the middle extruded aluminum sheet is composed of a water chamber 1-1, an outer fin 1-2, an inner fin 1-3 and a connecting part 1-4 consists of four parts; water chamber 1-1 consists of a plurality of intermediate water chamber units with a length of 2cm to 10cm and a width of 1cm to 3cm and two end water chamber units with a length of 1cm to 4cm and a width of 6cm to 15cm. , the wall thickness of the water chamber 1-1 is 4mm ~ 8mm, the multi-unit water chamber structure helps to enhance the pressure resistance of the boiler; the outer fins 1-2 are on the outer surfaces of both sides of the water chamber 1-1, and the The flue gas entering the gradually expanding flue 2 is in contact with heat exchange, the fin tongue ratio is less than 5, the root width is 3mm~10mm, the fin height is 5mm~50mm, and the fin surface is in a sawtooth or wave shape to increase the fin surface area, Expand the heating surface; the inner fins 1-3 are arranged on the inside of the water chamber 1-1, the fin tongue ratio is less than 5, the root width is 2mm~5mm, the fin height is 4mm~14mm, and the fin surface is serrated or wavy. Increase the surface area of the fins and expand the heating surface; the connecting parts 1-4 are located on the short sides of the two ends of the water chamber units, which play the role of connecting two adjacent extruded aluminum heat transfer units 1 and sealing the flue gas; The pressed aluminum sheet is also composed of four parts: the water chamber 1-1, the outer fin 1-2, the inner fin 1-3 and the connecting part 1-4. The outer fin 1-2 and the connecting part 1-4 are only in the water chamber. The flue gas side of 1-1 and the air side of the water chamber 1-1 have no outer fins 1-2 and connecting parts 1-4.

The extruded aluminum heat transfer unit 1 is subjected to secondary processing after being extruded by an extruder; circular inlets 1-5 with a diameter of 20mm to 60mm are cut out on the long side walls of the water chamber units at both ends. Circular outlet 1-6; screw holes are machined on the upper and lower end faces of the extruded aluminum heat transfer unit 1 to fix the upper and lower sealing cover plates; the water side channel 20mm to 60mm away from the upper and lower ends of the water chamber 1-1 Cut off the wall surface and inner fins 1-3 to form a connected water chamber space 1-8 with a height of 20mm to 60mm, which is used as the upper and lower headers of multiple water side channels; 2 parts are removed, and the fin root with a height of 2mm to 5mm is retained to form the entry short fin area 1-10; between the short fin area 1-10 and the normal outer fin 1-2, a transition area 1 with a length of more than 100mm is cut obliquely. -9, change the cross-sectional area of flue gas flow by changing the height of the outer fins, control the flow rate of flue gas, and avoid the high flow rate of flue gas in the inlet section; the surface of the extruded aluminum heat transfer unit 1 is subjected to anodization and electrophoresis coating treatment, so as to Enhanced corrosion resistance to condensate.

The extruded aluminum heat transfer unit 1 is assembled with the socket head cap screws 1-11, the sealing cover plate 1-12, the equalizing plate 1-13 and the flow core 1-14 after the secondary processing; the socket head cap screws 1-11 are used for The sealing cover plate 1-12 is fixed; there are countersunk holes on the sealing cover plate 1-12, and there is a sealing groove on the end side of the extruded aluminum heat transfer unit 1, and a silicone sealing ring is placed in the sealing groove to seal the extrusion The upper and lower ends of the aluminum heat transfer unit 1; the equalizing plate 1-13 is placed between the connecting water chamber space 1-8 and the water chamber 1-1, and the water flow rate of each water chamber 1-1 is uniform by using the small hole resistance Distribution; the flow cores 1-14 are fixed by the equalizing plates 1-13 on the upper and lower sides, and are composed of a plurality of cylinders or spiral cylinders that pass through the water chamber 1-1, which are used to disturb the flow of the water side and reduce the size of each water chamber 1-1. The flow area is increased, the water-side flow rate is increased, and the water-side heat exchange is strengthened; The lower part of the plate 1-13 enters each water chamber 1-1, and then leaves the water chamber 1-1 from the upper part of the equalizing plate 1-13 on the upper side, enters the upper connecting water chamber space 1-8, and leaves from the circular outlet 1-6 Extruded aluminium heat transfer unit 1.

The extruded aluminum heat transfer unit 1 is connected with the inlet header 4 and the outlet header 5 through a flexible connection. The inlet header 4 and the outlet header 5 are arranged on the outside of all the extruded aluminum heat transfer units 1, and are connected with all the extruded aluminum heat transfer units 1. The aluminum extrusion heat transfer unit 1 is connected; the wall thickness of the extruded aluminum is only 4mm to 8mm, and tapping the threaded holes directly on the wall surface is easy to slip and leak water. The inlet header 4 and the outlet header 5 use built-in outer wire joints 4-1 , the external inner wire joint 4-2 and the silicone sealing ring 4-3 are connected to the extruded aluminum heat transfer unit 1; the built-in outer wire joint 4-1 is placed in the water chamber units at both ends of the water chamber 1-1, and the The outer wire joint 4-1 extends out of the water chamber 1-1 through the circular inlet 1-5 and the circular outlet 1-6 and is connected to the external inner wire joint 4-2, and the silicone sealing ring 4-3 is located in the built-in outer wire joint 4 Between the annular fixed base of -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 receiving plate 3 through flange bolts, extruded Semicircular bolt holes are reserved for the sealing cover plates 1-12 at both ends of the aluminum heat transfer unit 1. The semicircular bolt holes between the two sealing cover plates form a complete bolt hole, which is connected to the flanges of the gradually expanding flue 2 and the dew receiving plate 3. The bolt holes on the top correspond one by one, add a sealing gasket in the middle, and use bolts to connect.

A modular extruded aluminum condensing boiler structure includes an extruded aluminum heat transfer unit 1, a fully premixed fire row burner 6, a dew receiving tray 3, an inlet header 4 and an outlet header 5; the modularized On the basis of the modular extruded aluminum condensing heat exchanger, the extruded aluminum condensing boiler replaces the inlet gradually expanding flue 2 with a fully premixed fire row burner 6 to form a single condensing boiler, and lengthens the extruded aluminum heat exchanger. The heat unit 1 and part of the outer fins in the flame area of the burner are cut off, and the rest of the components remain unchanged; the fully premixed fire row burner 6 is composed of a pressurized air hood 6-1 and an isobaric gas distribution chamber 6-2 , the ejector 6-3, the gas mixing chamber 6-4 and the combustion head 6-5; the upper flange of the booster hood 6-1 is connected with the booster fan, and the internal pressure is greater than the atmospheric pressure, enhancing the ejector The ejection capacity of 6-3 achieves an excess air coefficient greater than 1.1; the isobaric gas distribution chamber 6-2 is arranged below the booster hood 6-1, and adopts an isobaric air duct design to ensure that each nozzle on it is distributed to The same amount of gas; the ejector 6-3 is arranged below each nozzle of the isobaric gas distribution chamber 6-2; the gas mixing chamber 6-4 is arranged under the ejector 6-3, and the gas mixing chamber 6-4 passes through the multiple nozzles. The ejectors 6-3 and the multiple nozzles on the isobaric gas distribution chamber 6-2 are communicated with the isobaric gas distribution chamber 6-2, and the gas injects air into the gas mixing chamber 6-4, where the fuel gas and the air are evenly mixed ; The combustion head 6-5 communicates with the bottom of the gas mixing chamber 6-4 and is distributed between the extruded aluminum heat transfer units 1. The mixed gas leaves the gas mixing chamber 6-4 and enters the combustion head 6-5 for combustion.

The combustion head 6-5 extends into the furnace space formed by the inlet low-fin area 1-10, and the combustion head bottom 6-5-1 is fixed on the sealing cover plate 1-12 of the extruded aluminum heat transfer unit 1, and the combustion The middle part 6-5-2 of the head is an isosceles trapezoid, the head part 6-5-4 of the combustion head is a semicircle; the height of the middle part 6-5-2 of the combustion head is 50mm-150mm, and the wall of the isosceles trapezoid section is processed The triangular opening 6-5-3 is formed, and the negative pressure area formed by the high-speed airflow inside the combustion head 6-5 is used to eject the positive pressure flue gas in the furnace, thereby delaying the combustion, weakening the high temperature area of the flame, and reducing thermal nitrogen oxides The combustion head head 6-5-4 is evenly distributed with circular openings with a diameter of 2mm to 5mm to equalize the mixture and prevent tempering. The semicircle of the combustion head head 6-5-4 Compared with the flat head, the combustion area of the head is increased by 50%; the head of the combustion head 6-5-4 is wrapped with a layer of metal fiber mesh, and the mixture is ignited and burned on the surface of the metal fiber mesh; the combustion head 6- 5 is also equipped with an igniter and a flame detector to ignite and detect the combustion state of the flame and adjust the ejection ratio.

In order to ensure sufficient heat exchange, the length of the extruded aluminum heat transfer unit 1 of the modular extruded aluminum condensing boiler is 200mm to 3000mm; in order to provide sufficient combustion space and avoid excessive fin temperature in the combustion area, the The height of the fins in the short fin area 1-10 at the entrance is controlled at 2mm~8mm, and the length of the short fin area 1-10 at the entrance is 150mm~450mm; according to the change of flue gas temperature, determine the reasonable flue gas flow cross-sectional area, and then determine the external The height of the fins determines the length of the chamfered area and the height of the fins to ensure that the flue gas flow rate is controlled within the economical heat exchange range of 4m/s to 10m/s; Enhance high temperature corrosion resistance.

The modular extruded aluminum condensing boiler has various combinations; a plurality of extruded aluminum heat transfer units 1 are connected in the horizontal direction to form a first-stage extruded aluminum heat transfer module, and the condensing boiler includes one or two extruded aluminum heat transfer modules. Aluminum heat transfer module; full premixed fire row burner 6 bottom-up burning or top-down burning; the flue gas of two extruded aluminum heat transfer modules flows in the same direction or in the opposite direction; comprehensively consider the collection of condensate and the For the safe work of the burner, five combinations are proposed: when the full premixed fire row burner 6 is placed at the bottom and contains two extruded aluminum heat transfer modules, the full premixed fire row burner 6 is placed in the modular extrusion. The bottom of the aluminum-pressed condensing boiler is with the combustion head 6-5 facing upward, the gas is ignited at the bottom, and the flue gas passes through the first extruded aluminum heat transfer module 1-A from bottom to top, and then enters the connecting flue 7 and then turns 180° downward. Entering the second extruded aluminum heat transfer module 1-B, the flue gas flows downward and is condensed to cool down. The flue gas finally enters the dew receiving tray 3, and the condensate is collected by the dew receiving tray 3 at the bottom and then discharged; when fully premixed When the fire row burner 6 is placed at the bottom and includes an extruded aluminum heat transfer module, the fully premixed fire row burner 6 is placed at the bottom of the boiler with the combustion head 6-5 facing upward, the gas is ignited at the bottom, and the flue gas enters the extrusion. The extruded aluminum heat transfer module rises and flows to the top for discharge. At this time, it is necessary to ensure that the outlet water temperature of the modular extruded aluminum condensing boiler is greater than 50 °C; During the module, the fully premixed fire row burner 6 is placed on the top of the modular extruded aluminum condensing boiler with the combustion head 6-5 facing down, the top of the gas is ignited, the flue gas flows down, enters the extruded aluminum heat transfer module and After being cooled and condensed, the dew tray 3 is arranged under the extruded aluminum heat transfer module to collect the condensate; when the fully premixed fire row burner 6 is placed on top and contains two extruded aluminum heat transfer modules, the fully premixed The fire row burner 6 is placed on the top of the boiler with the combustion head 6-5 facing downward, the first extruded aluminum heat transfer module 1-A is arranged under the fully premixed fire row burner 6, and the second extruded aluminum heat transfer module The module 1-B is arranged below the first extruded aluminum heat transfer module 1-A, the top of the gas is ignited, and the flue gas flows downward, and successively enters the first extruded aluminum heat transfer module 1-A and the second extruded aluminum heat transfer module 1-A. The heat module 1-B is cooled and condensed, and the dew receiving tray 3 is arranged under the second extruded aluminum heat transfer module 1-B to collect the condensate; When pressing the aluminum heat transfer module, the fully premixed fire row burner 6 is placed on the top of the modular extruded aluminum condensing boiler with the combustion head 6-5 facing down, the gas is ignited at the top, and the flue gas enters the first extrusion The aluminum heat transfer module 1-A is cooled, and after passing through the connecting flue 7, it turns 180 degrees and flows upward, and enters the second extruded aluminum heat transfer module 1-B to be cooled and condensed, and the flue gas is in the second extruded aluminum heat transfer module. The top of 1-B is discharged from the boiler, and the condensate is collected at the bottom of the dew tray 3 and discharged.

When the modular extruded aluminum condensing boiler includes two extruded aluminum heat transfer modules, the working fluid of the second-stage extruded aluminum heat transfer module adopts boiler return water, heat pump evaporator circulating water or tap water; When water is used as the working fluid, the condensed amount of flue gas of the second-stage extruded aluminum heat transfer module depends on the return water temperature. If the return water temperature is too high, the condensed amount of flue gas will be reduced; when the circulating water of the heat pump evaporator is used as the working fluid , the temperature of the working fluid is low and the temperature is stable, the condensation amount of the flue gas is maintained at a high level, and the residual energy in the flue gas is deeply recovered. The heat pump condenser is used to preheat the boiler return water or heat the tap water to obtain bath water; When the temperature of the tap water is low, the flue gas is deeply condensed, the residual energy of the flue gas is recovered, and the tap water is heated to more than 30 ℃, but the tap water directly enters the extruded aluminum heat transfer unit 1, which may cause corrosion problems. The heat exchange of the heat exchanger, the heat exchange between the plate heat exchanger and the second-stage extruded aluminum heat transfer module, avoids the corrosion problem caused by the direct contact of the tap water with the extruded aluminum.

The innovation points, advantages and positive effects of the present utility model are:

1. A modular extruded aluminum condensing heat exchanger structure and condensing boiler structure of the present utility model take the extruded aluminum heat transfer unit as the main body. Extruded aluminum heat transfer unit with header, water inlet and outlet, and self-sealing connection structure, changing the number and quantity of extruded aluminum heat transfer units can obtain condensing heat exchangers and condensing boilers of different powers, only one set of extrusion Aluminum molds are sufficient, which greatly reduces design and manufacturing costs.

2. A modular extruded aluminum condensing heat exchanger structure and a condensing boiler structure of the present invention introduce extruded aluminum materials into the field of boilers and heat exchangers, and the cost of extruded aluminum is only 30% of that of cast aluminum silicon. 60% of stainless steel, after surface anodizing and electrophoretic coating treatment, it has excellent corrosion resistance to condensate; extruded aluminum material can be infinitely long in the forming direction, and has a longer heat resistance than cast aluminum silicon and stainless steel materials. On the surface, the heat exchange is more sufficient, and deep condensation can be achieved.

3. A modular extruded aluminum condensing heat exchanger structure and condensing boiler structure of the present utility model adopts a fully premixed fire row type burner, and uses a booster fan to realize fully premixed combustion; according to the characteristics of the extruded aluminum boiler The combustion head is arranged in the furnace space formed by the extruded aluminum heat transfer unit, and the center of the flame is far away from the upper and lower headers to avoid supercooled boiling; Cold boiling and seal plate expansion cracking problems.

4. The modular extruded aluminum condensing condensing boiler structure of the present utility model has various arrangements and combinations, and the burner can be placed on the bottom or on the top; Different circulating working fluids, deep condensing flue gas, provide domestic hot water while heating; when the layout space is limited, the condensing boiler can adopt a two-stage combination, and the height of the boiler is reduced by half; The boiler room is assembled uniformly, and there is no need to reserve a hoisting door in the boiler room; various combinations can meet various site requirements.

5. A modular extruded aluminum condensing heat exchanger structure and condensing boiler structure of the present utility model use tap water and heat pump evaporator circulating water as the working fluid of the condensing heat exchanger or the condensing section, and the temperature of the working fluid can be controlled at 20°C. ℃ below, to achieve the deep condensation target that the exhaust gas temperature is lower than 30 ℃.

Description of drawings

Figure 1 is a schematic structural diagram of a modular extruded aluminum condensing heat exchanger of the present invention.

2 is a schematic cross-sectional view of an extruded aluminum heat transfer unit of a modular extruded aluminum condensing heat exchanger structure and a condensing boiler structure of the present utility model, wherein: FIG. 2a is a cross-sectional schematic diagram of the middle extruded aluminum heat transfer unit; FIG. 2b is a cross-sectional schematic diagram of the self-sealing assembly of the left and right extruded aluminum heat transfer units and the middle extruded aluminum heat transfer unit.

Fig. 3 is a three-dimensional schematic diagram of an extruded aluminum heat transfer unit after secondary processing of a modular extruded aluminum condensing heat exchanger structure and a condensing boiler structure of the present invention.

4 is a perspective view of the assembled extruded aluminum heat transfer unit of a modular extruded aluminum condensing heat exchanger structure and a condensing boiler structure of the present invention.

5 is a schematic diagram of the connection between the water side and the flue gas side of an extruded aluminum heat transfer unit of a modular extruded aluminum condensing heat exchanger structure and a condensing boiler structure of the present invention, wherein FIG. 5a is a schematic diagram of the water side connection; Figure 5b is a schematic diagram of the connection on the flue gas side.

Fig. 6 is a schematic diagram of the structure of a modular extruded aluminum condensing boiler of the present invention.

7 is a schematic diagram of an overhead full premixed fire row burner of a modular extruded aluminum condensing boiler structure of the present invention, wherein FIG. 7a is a schematic diagram of a full premixed fire row burner; FIG. 7b is a combustion Schematic diagram of the head.

8 is a schematic diagram of the assembly of a modular extruded aluminum condensing heat exchanger structure and a condensing boiler with a condensing boiler structure of the present invention, wherein, FIG. 8 a is a schematic diagram of a double heat transfer module with a bottom burner; Schematic diagram of the dual heat transfer module of the burner.

9 is a schematic diagram of the water side connection of a dual heat transfer module condensing boiler with a modular extruded aluminum condensing boiler structure of the present invention, wherein, FIG. 9a is a second-stage heat transfer module using boiler return water as the working fluid Schematic diagram; Figure 9b is a schematic diagram of the second-stage heat transfer module using the heat pump evaporator circulating water as a working fluid and preheating the boiler return water; Figure 9c is a schematic diagram of the second-stage heat transfer module heating tap water through a plate heat exchanger.

Detailed ways

The utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in FIG. 1, the present utility model has a modular extruded aluminum condensing heat exchanger structure, and the modular extruded aluminum condensing heat exchanger structure includes an extruded aluminum heat transfer unit 1, an inlet gradually expanding flue 2, a dew duct Pan 3, inlet header 4 and outlet header 5; the tail of the oil-fired gas boiler body is connected to the inlet gradually expanding flue 2, and the boiler exhaust smoke at 80 ℃ ~ 130 ℃ enters each extruded aluminum evenly through the inlet gradually expanding flue 2 The heat transfer unit 1 is condensed and cooled to below 45°C, and is discharged into the chimney through the dew receiving tray 3; the inlet header 4 and the outlet header 5 are placed on the same side of the condensing heat exchanger, and are connected to all extruded aluminum heat transfer units 1, The cooling medium can be selected from heat pump evaporator circulating water, boiler feed water or tap water; the condensate is collected at the bottom of the dew tray 3 and discharged through the U-shaped water seal pipe.

As shown in Fig. 2a and Fig. 2b, the extruded aluminum heat transfer unit 1 includes a middle extruded aluminum sheet and left and right extruded aluminum sheets; the middle extruded aluminum sheet is composed of a water chamber 1-1, outer fins 1-2. The inner fin 1-3 and the connecting part 1-4 are composed of four parts; the water chamber 1-1 consists of a plurality of intermediate water chamber units with a length of 2cm-10cm and a width of 1cm-3cm and a length of 1cm-4cm , It is composed of water chamber units at both ends with a width of 6cm to 15cm. The wall thickness of the water chamber 1-1 is 4mm to 8mm. The multi-unit water chamber structure helps to enhance the pressure resistance of the boiler; the outer fins 1-2 are in The outer surfaces of the two sides of the water chamber 1-1 are in contact with the flue gas entering from the inlet gradually expanding flue 2 for heat exchange. The fin tongue ratio is less than 5. It has a sawtooth or wave shape to increase the surface area of the fins and expand the heating surface; the inner fins 1-3 are arranged inside the water chamber 1-1, the fin tongue ratio is less than 5, the root width is 2mm to 5mm, and the fin height is 4mm ～14mm, the surface of the fins is serrated or wavy to increase the surface area of the fins and expand the heating surface; the connecting parts 1-4 are located on the short sides of both sides of the water chamber units at both ends to connect two adjacent extruded aluminum The heat transfer unit 1 and the function of sealing the flue gas; the left and right extruded aluminum sheets are also composed of four parts: the water chamber 1-1, the outer fins 1-2, the inner fins 1-3 and the connecting parts 1-4. 1-2 and the connecting part 1-4 are only on the flue gas side of the water chamber 1-1, and the air side of the water chamber 1-1 does not have the outer fins 1-2 and the connecting part 1-4.

As shown in Figure 3, the extruded aluminum heat transfer unit 1 is subjected to secondary processing after being extruded by the extruder; Circular inlet 1-5 and circular outlet 1-6; screw holes are machined on the upper and lower end faces of the extruded aluminum heat transfer unit 1 to fix the upper and lower sealing cover plates; the upper and lower ends of the water chamber 1-1 are The 20mm～60mm water side channel wall and inner fins 1-3 are cut off to form connected water chamber spaces 1-8 with a height of 20mm～60mm, which are used as the upper and lower headers of multiple water side channels; The 300mm outer fins 1-2 are partially cut off, and the 2mm to 5mm high fin roots are retained to form the entry short fin area 1-10; the short fin area 1-10 and the normal outer fin 1-2 are cut out obliquely For the transition zone 1-9 with a length of more than 100mm, the cross-sectional area of flue gas flow can be changed by changing the height of the outer fins, so as to control the flue gas flow rate and prevent the flue gas flow rate from being too high in the inlet section; the surface of the extruded aluminum heat transfer unit 1 is anodic Oxidized and electrophoretic coated for enhanced condensate resistance.

As shown in FIG. 4 , the extruded aluminum heat transfer unit 1 is assembled with the socket head cap screws 1-11, the sealing cover plate 1-12, the equalizing plate 1-13 and the flow core 1-14 after the secondary processing; Hexagon screws 1-11 are used to fix the sealing cover 1-12; there are countersunk holes on the sealing cover 1-12, and there is a sealing groove on the side of the extruded aluminum end, and a silicone sealing ring is placed in the sealing groove to seal The upper and lower ends of the aluminum heat transfer unit 1 are extruded, and the equalizing plates 1-13 are placed between the connecting water chamber space 1-8 and the water chamber 1-1, and the water in each water chamber 1-1 is made of small hole resistance. The flow is evenly distributed; the flow cores 1-14 are fixed by the upper and lower flow equalizing plates 1-13, and are composed of a plurality of cylinders or spiral cylinders that pass through the water chambers 1-1, which are used to disturb the flow of the water side and reduce the size of each water chamber 1 -1 Circulation cross-sectional area, increase the water-side flow velocity, and strengthen the water-side heat exchange. The cooling medium enters the connecting water chamber space 1-8 at the lower part of the extruded aluminum heat transfer unit 1 through the circular inlet 1-5 at the bottom, and enters each water chamber 1-1 through the lower part of the flow equalizing plate 1-13 on the lower side, and then Leave the water chamber 1-1 from the upper part of the equalizing plate 1-13 on the upper side, enter the upper communication water chamber space 1-8, and leave the extruded aluminum heat transfer unit 1 from the circular outlet 1-6.

As shown in Figure 5, in order to ensure the sealing and connection of the modular extruded aluminum condensing heat exchanger and the flue gas side and the water side of the condensing boiler, the inlet header 4 and the outlet header 5 are arranged in all extruded aluminum heat transfer The outside of unit 1 is connected to all extruded aluminum heat transfer units 1 through soft connections; the thickness of the extruded aluminum wall is only 4mm to 8mm, and tapping threaded holes directly on the wall is easy to slip and leak water, as shown in Figure 5a and Figure 5b , using the built-in outer wire joint 4-1, the outer inner wire joint 4-2 and the silicone sealing ring 4-3 to connect the extruded aluminum heat transfer unit 1 with the header to form a complete water circuit; the built-in outer wire joint 4-1 Placed in the water chamber units at both ends of the water chamber 1-1, the built-in outer wire joint 4-1 extends out of the water chamber 1-1 through the circular inlet 1-5 and the circular outlet 1-6 and the external inner wire union 4 -2 connection, the silicone sealing ring 4-3 is located between the annular fixed base of the built-in outer wire joint 4-1 and the inner wall surface of the water chamber 1-1; as shown in Figure 5c, the extruded aluminum heat transfer unit 1 It is connected with the inlet gradually expanding flue 2 and the dew receiving plate 3 by flange bolts, and the sealing cover plates 1-12 at both ends of the aluminum heat transfer unit 1 are extruded to reserve semicircular bolt holes, and the semicircular bolt holes between the two sealing cover plates are reserved. The bolt holes form a complete bolt hole, which corresponds to the bolt holes on the connecting flange of the gradually expanding flue 2 and the dew receiving plate 3, and the sealing gasket is added in the middle, and the bolts are used for connection.

As shown in Fig. 6, the modular extruded aluminum condensing boiler structure of the present invention includes: extruded aluminum heat transfer unit 1, dew receiving tray 3, inlet header 4, outlet header 5 and full premixed fire row type Burner 6; the evenly mixed gas air is ignited and burned in the furnace space formed by the extruded aluminum heat transfer unit 1, and the flue gas is cooled and condensed to below 45°C during the downward flow, and enters the chimney through the dew receiving plate 3 for discharge; 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 receiving tray 3 and discharged through the U-shaped water seal pipe.

As shown in FIG. 7 a in FIG. 7 , the fully premixed fire row burner 6 is composed of a pressurized air hood 6-1, an isobaric gas distribution chamber 6-2, an ejector 6-3, and a gas mixing chamber 6 -4 is composed of the combustion head 6-5; the upper flange of the booster hood 6-1 is connected to the booster fan, and the internal air pressure is slightly higher than the atmospheric pressure, which enhances the ejection capacity of the ejector 6-3 and realizes excess air The coefficient is greater than 1.1; the isobaric gas distribution chamber 6-2 adopts an equal pressure air duct design to ensure that each nozzle distributes the same amount of gas; the ejector 6-3 is arranged below the isobaric gas distribution chamber 6-2; After the air is injected, it enters the gas mixing chamber 6-4, and the gas and air are evenly mixed; the combustion head 6-5 is connected to the bottom of the gas mixing chamber 6-4 and is distributed between the extruded aluminum heat transfer units 1, and the mixed gas leaves the gas mixing chamber 6 After -4, it enters the combustion head 6-5, and burns in the furnace space formed by the extruded aluminum heat transfer unit 1. The combustion head 6-5 protrudes into the furnace space formed by the inlet low fin area 1-10. As shown in Figure 7b, the combustion head bottom 6-5-1 is fixed on the sealing cover plate of the extruded aluminum heat transfer unit 1 On 1-12, the middle part 6-5-2 of the combustion head is an isosceles trapezoid, the head part 6-5-4 of the combustion head is a semicircle; the height of the middle part 6-5-2 of the combustion head is 50mm to 150mm, etc. Triangular openings 6-5-3 are processed on the wall of the waist trapezoid section, and the negative pressure area formed by the high-speed airflow inside the combustion head 6-5 is used to inject the positive pressure flue gas in the furnace, thereby delaying the combustion and weakening the high temperature area of the flame. Reduce the generation of thermal nitrogen oxides; circular openings with diameters of 2mm to 5mm are evenly distributed on the head 6-5-4 of the combustion head to equalize the mixture and prevent tempering. The head of the combustion head 6-5 The combustion area of the semi-circular head of -4 is increased by 50% compared with the flat head; the head of the combustion head 6-5-4 is wrapped with a layer of metal fiber mesh, and the mixture is ignited on the surface of the metal fiber mesh Combustion; the combustion head 6-5 is also equipped with an igniter and a flame detector to ignite and detect the combustion state of the flame and adjust the ejection ratio.

In order to ensure sufficient heat exchange, the length of the extruded aluminum heat transfer unit 1 of the modular extruded aluminum condensing boiler structure is 200mm to 3000mm; in order to provide sufficient combustion space and avoid excessively high fin temperature in the combustion area, Control the height of the fins of the short-fin area 1-10 at the entrance to 2mm~8mm, and the length of the short-fin area 1-10 at the entrance to 150mm~450mm; According to the change of flue gas temperature, determine a reasonable flue gas flow cross-sectional area, and then determine The height of the outer fins determines the length of the chamfered area and the height of the fins to ensure that the flue gas flow rate is controlled within the economical heat exchange range of 4m/s to 10m/s; To enhance high temperature corrosion resistance.

The modular extruded aluminum condensing boiler structure has various combinations; a plurality of extruded aluminum heat transfer units 1 are connected in the horizontal direction to form a first-stage extruded aluminum heat transfer module, and the condensing boiler includes one or two extruded aluminum heat transfer modules. Extruded aluminum heat transfer module; full premixed fire row burner 6 bottom-up burning or top-down burning; the flue gas of two extruded aluminum heat transfer modules flows in the same direction or in the opposite direction; comprehensively consider the collection of condensate According to the safety work of the burner, five combinations are proposed: as shown in Figure 8a in Figure 8, when the full premixed fire row burner 6 is placed at the bottom and contains two extruded aluminum heat transfer modules, the full premixed fire The row burner 6 is placed at the bottom of the modular extruded aluminum condensing boiler with the combustion head 6-5 facing upward, the gas is ignited at the bottom, and the flue gas passes through the first extruded aluminum heat transfer module 1-A from bottom to top, and enters After connecting the flue 7, it turns 180° downward and enters the second extruded aluminum heat transfer module 1-B. The flue gas flows downward and is condensed and cooled down. The flue gas finally enters the dew plate 3, and the condensate is dew from the bottom of the condensate. Disk 3 is collected and discharged, and the boiler return water first enters the inlet header of the second extruded aluminum heat transfer module 1-B, leaves from the outlet header, and then enters the inlet header of the first extruded aluminum heat transfer module 1-A, Leave from the outlet header; as shown in Figure 8b in Figure 8, when the full premixed fire row burner 6 is placed overhead and includes two extruded aluminum heat transfer modules, the full premixed fire row burner 6 is placed On the top of the boiler with the combustion head 6-5 facing down, the first extruded aluminum heat transfer module 1-A is arranged below the full premixed fire row burner 6, and the second extruded aluminum heat transfer module 1-B is arranged in the first extruded aluminum heat transfer module 1-B. Under the first extruded aluminum heat transfer module 1-A, the top of the gas is ignited, and the flue gas flows downward, and successively enters the first extruded aluminum heat transfer module 1-A and the second extruded aluminum heat transfer module 1-B to be cooled. and condensation, the dew receiving tray 3 is arranged under the second extruded aluminum heat transfer module 1-B to collect condensate; the boiler return water first enters the inlet header of the second extruded aluminum heat transfer module 1-B, and collects from the outlet The box leaves, and then enters the inlet header of the first extruded aluminum heat transfer module 1-A, leaves from the outlet header, and the condensate is collected by the dew receiving tray 3 at the bottom and then discharged. When the full premixed fire row burner 6 is placed at the bottom and includes an extruded aluminum heat transfer module, the full premixed fire row burner 6 is placed at the bottom of the boiler with the combustion head 6-5 facing upward, and the gas is ignited at the bottom, The flue gas enters the extruded aluminum heat transfer module and flows upward to the top to be discharged. At this time, it is necessary to ensure that the outlet water temperature of the modular extruded aluminum condensing boiler is greater than 50 °C. When the fully premixed fire row burner 6 is overhead and includes an extruded aluminum heat transfer module, the full premixed fire row burner 6 is placed on top of the modular extruded aluminum condensing boiler with the combustion heads 6-5 facing The top of the gas is ignited, the flue gas flows downward, enters the extruded aluminum heat transfer module and is cooled and condensed. The dew receiving tray 3 is arranged under the extruded aluminum heat transfer module to collect the condensate. When the burner 6 is overhead and contains two extruded aluminum heat transfer modules, the fully premixed fire row burner 6 is placed on the top of the modular extruded aluminum condensing boiler with the combustion head 6-5 facing down, and the gas is ignited at the top , the flue gas enters the first extruded aluminum heat transfer module 1-A downward to be cooled, passes through the connecting flue 7 and then turns 180 degrees and flows upward, enters the second extruded aluminum heat transfer module 1-B to be cooled and condensed, and the smoke The gas is discharged from the boiler at the top of the second extruded aluminum heat transfer module 1-B, and the condensate is collected at the bottom of the dew receiving tray 3 and discharged.

As shown in Figure 9, when the extruded aluminum heat transfer unit 1 in the extruded aluminum modular condensing boiler structure is arranged in two stages, the working fluid of the second stage extruded aluminum heat transfer module can be boiler return water, heat pump Evaporator circulating water, tap water, etc; The inlet header of the first-stage extruded aluminum heat transfer module supplies heat after leaving the outlet header; as shown in Figure 9b, when the circulating water of the heat pump evaporator is used as the working fluid, the boiler return water first enters the heat pump condenser for preheating , then enter the inlet header of the first-stage extruded aluminum heat transfer module, and supply heat after leaving the outlet header; as shown in Figure 9c, when the second-stage extruded aluminum heat transfer module is used to heat tap water, the The plate heat exchanger heats the tap water indirectly, avoiding the corrosion and scaling problems caused by the direct heating of the tap water.

Claims (10)

1. A modular extruded aluminum condensing heat exchanger structure is characterized in that: comprising an extruded aluminum heat transfer unit (1), an inlet gradually expanding flue (2), a dew receiving tray (3), an inlet header ( 4) and an outlet header (5); the inlet gradually expanding flue (2) is located at the top of the extruded aluminum heat transfer unit (1), and the dew receiving tray (3) is located at the bottom of the extruded aluminum heat transfer unit (1), The inlet header (4) and the outlet header (5) are placed on the same side of the condensing heat exchanger, and are connected to all extruded aluminum heat transfer units (1). The condensate is collected at the bottom of the dew tray (3) and discharged through the U-shaped water seal pipe. 2. A modular extruded aluminum condensing heat exchanger structure according to claim 1, characterized in that: the extruded aluminum heat transfer unit (1) comprises a middle extruded aluminum sheet and a left and right extruded aluminum sheet; The middle extruded aluminum sheet is composed of four parts: 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) It consists of a plurality of intermediate water chamber units with a length of 2cm to 10cm and a width of 1cm to 3cm and two end water chamber units with a length of 1cm to 4cm and a width of 6cm to 15cm. The wall thickness of the water chamber (1-1) is 4mm to 8mm, the multi-unit water chamber structure helps to enhance the pressure resistance of the boiler; the outer fins (1-2) are on the outer surfaces of both sides of the water chamber (1-1), and the flue (2) gradually expands from the inlet. ) The incoming flue gas contacts heat exchange, the fin tongue ratio is less than 5, the width of the root is 3mm~10mm, the height of the fin is 5mm~50mm, and the surface of the fin is sawtooth or wave shape to increase the surface area of the fin and expand the heating surface; The inner fins (1-3) are arranged inside the water chamber (1-1), the tongue ratio of the fins is less than 5, the width of the root is 2mm to 5mm, the height of the fins is 4mm to 14mm, and the surface of the fins is in a sawtooth or wavy shape. Increase the surface area of the fins and expand the heating surface; the connecting parts (1-4) are located on the short sides of both sides of the water chamber units at both ends, and play the role of connecting two adjacent extruded aluminum heat transfer units (1) and sealing the flue gas. Function; the left and right extruded aluminum sheets are also composed of four parts: the water chamber (1-1), the outer fins (1-2), the inner fins (1-3) and the connecting part (1-4). 1-2) and the connecting part (1-4) are only on the flue gas side of the water chamber (1-1), and the air side of the water chamber (1-1) has no outer fins (1-2) and connecting part (1) -4). 3. A modular extruded aluminum condensing heat exchanger structure according to claim 2, characterized in that: the extruded aluminum heat transfer unit (1) needs to be extruded twice after being extruded by an extruder. Processing; cut out a circular inlet (1-5) and a circular outlet (1-6) with a diameter of 20mm to 60mm on the long side walls of the water chamber units at both ends; Screw holes are machined on the upper and lower end faces to fix the upper and lower sealing cover plates; cut off the water side channel wall and inner fins (1-3) 20mm to 60mm away from the upper and lower ends of the water chamber (1-1) to form The connected water chamber space (1-8) with a height of 20mm to 60mm is used as the upper and lower headers of multiple water side channels; the outer fins (1-2), which are 50mm to 300mm away from the flue gas inlet, are partially cut off, and 2mm to 5mm are reserved. The root of the high fin forms the short fin area (1-10) of the entrance; the transition area (1-10) with a length of more than 100mm is cut obliquely between the short fin area (1-10) and the normal outer fin (1-2). 9), change the cross-sectional area of flue gas flow by changing the height of the outer fins, control the flue gas flow rate, and avoid the flue gas flow rate in the inlet section being too high; the surface of the extruded aluminum heat transfer unit (1) is subjected to anodization and electrophoresis coating treatment , to enhance the corrosion resistance of condensate. 4. A modular extruded aluminum condensing heat exchanger structure according to claim 3, characterized in that: the extruded aluminum heat transfer unit (1) is connected with the socket head cap screws (1-11 after secondary processing) ), sealing cover (1-12), equalizing plate (1-13) and flow core (1-14) assembly; socket head cap screws (1-11) are used to fix the sealing cover (1-12); sealing There are countersunk holes on the cover plate (1-12), and there is a sealing groove on the end side of the extruded aluminum heat transfer unit (1), and a silicone sealing ring is placed in the sealing groove to seal the extruded aluminum heat transfer unit (1). ) at the upper and lower ends; the equalizing plate (1-13) is placed between the connecting water chamber space (1-8) and the water chamber (1-1), and each water chamber (1-1) The flow of water is evenly distributed; the flow core (1-14) is fixed by the equalizing plates (1-13) on the upper and lower sides, and is composed of a plurality of cylinders or spiral cylinders penetrating the water chamber (1-1). 5. A modular extruded aluminum condensing heat exchanger structure according to claim 1, characterized in that: the extruded aluminum heat transfer unit (1) and the inlet header (4) and the outlet header (5) ) is connected by a soft connection, the inlet header (4) and the outlet header (5) are arranged on the outside of all extruded aluminum heat transfer units (1), and are connected with all extruded aluminum heat transfer units (1); extrusion The aluminum wall thickness is only 4mm to 8mm, and tapping the threaded holes directly on the wall is easy to leak water. The wire union (4-2) and the silicone sealing ring (4-3) are connected with the extruded aluminum heat transfer unit (1); the built-in outer wire joint (4-1) is placed at both ends of the water chamber (1-1). In the water chamber unit, the built-in outer wire joint (4-1) extends out of the water chamber (1-1) through the circular inlet (1-5) and the circular outlet (1-6) and is connected to the outer inner wire union (4- 2) Connection, the silicone sealing ring (4-3) is located between the annular fixed base of the built-in outer wire joint (4-1) and the inner wall surface of the water chamber (1-1); the extruded aluminum heat transfer unit ( 1) It is connected with the inlet gradually expanding flue (2) and the dew receiving plate (3) by flange bolts, and the sealing cover plates (1-12) at both ends of the extruded aluminum heat transfer unit (1) are reserved for semi-circular bolt holes. , The semi-circular bolt holes between the two sealing cover plates form a complete bolt hole, which corresponds to the bolt holes on the connecting flange of the gradually expanding flue (2) and the dew plate (3), and a sealing gasket is added in the middle. , using bolted connections. 6. A modular extruded aluminum condensing boiler structure, characterized in that it comprises an extruded aluminum heat transfer unit (1), a fully premixed fire row burner (6), a dew receiving tray (3), an inlet collector A tank (4), an outlet header (5) and a connecting flue (7); the modular extruded aluminum condensing boiler is based on the modular extruded aluminum condensing heat exchanger and the inlet gradually expands the flue (2). ) is replaced with a fully premixed fire row burner (6) to form a single condensing boiler, lengthen the extruded aluminum heat transfer unit (1) and cut off part of the outer fins in the burner flame area, and the rest of the components remain unchanged; The fully premixed fire row burner (6) is composed of a pressurized air hood (6-1), an isobaric gas distribution chamber (6-2), an ejector (6-3), and a gas mixing chamber (6). -4) and the combustion head (6-5); the upper flange of the booster hood (6-1) is connected to the booster fan, and the internal air pressure is greater than the atmospheric pressure, which enhances the ejector (6-3). The injection capacity can be increased to achieve an excess air coefficient greater than 1.1; the isobaric gas distribution chamber (6-2) is arranged below the booster hood (6-1), and the isobaric air duct design is adopted to ensure that each nozzle on it is distributed to equal The ejector (6-3) is arranged under each nozzle of the isobaric gas distribution chamber (6-2); the gas mixing chamber (6-4) is arranged under the ejector (6-3), the gas The mixing chamber (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), and the gas is ejected After the air enters the gas mixing chamber (6-4), the gas and the air are evenly mixed; the combustion head (6-5) is connected to the bottom of the gas mixing chamber (6-4) and is distributed between the extruded aluminum heat transfer units (1), After leaving the gas mixing chamber (6-4), the mixed gas enters the combustion head (6-5) for combustion. 7. The modular extruded aluminum condensing boiler structure according to claim 6, characterized in that: the combustion head (6-5) extends into the furnace space formed by the inlet short fin area (1-10), The bottom of the combustion head (6-5-1) is fixed on the sealing cover plate (1-12) of the extruded aluminum heat transfer unit (1). The middle part of the combustion head (6-5-2) is an isosceles trapezoid. The head (6-5-4) is semi-circular; the height of the middle part (6-5-2) of the combustion head is 50mm to 150mm, and a triangular opening (6-5-3) is processed on the wall of the isosceles trapezoid section. ; The head of the combustion head (6-5-4) is evenly distributed with circular openings with a diameter of 2mm to 5mm to equalize the mixture and prevent tempering. Compared with the flat head, the combustion area of the round head is increased by 50%; the head of the combustion head (6-5-4) is wrapped with a layer of metal fiber mesh, and the mixture is ignited and burned on the surface of the metal fiber mesh; The combustion head (6-5) is also equipped with an igniter and a flame detector to ignite and detect the combustion state of the flame and adjust the ejection ratio. 8. A modular extruded aluminum condensing boiler structure according to claim 6, characterized in that: in order to ensure sufficient heat exchange, the extruded aluminum heat transfer unit of the modular extruded aluminum condensing boiler The length of (1) is 200mm~3000mm; in order to provide sufficient combustion space and avoid excessively high fin temperature in the combustion area, the fin height of the short fin area (1-10) at the entrance is controlled to 2mm~8mm, and the short fin at the entrance is controlled. The length of the wing area (1-10) is 150mm to 450mm. 9. A modular extruded aluminum condensing boiler structure according to claim 6, characterized in that: the modular extruded aluminum condensing boiler has various combinations; a plurality of extruded aluminum heat transfer units (1) Connected in the horizontal direction to form a first-stage extruded aluminum heat transfer module, the condensing boiler contains one or two extruded aluminum heat transfer modules; full premixed fire row burner (6) The bottom burns upward or the top burns Downward combustion; the flue gas of the two extruded aluminum heat transfer modules flows in the same direction or in the opposite direction; comprehensively considers the collection of condensate and the safe operation of the burner, five combinations are proposed: when the fully premixed fire row burner (6) When it is placed at the bottom and contains two extruded aluminum heat transfer modules, the fully premixed fire row burner (6) is placed at the bottom of the modular extruded aluminum condensing boiler with the combustion head (6-5) facing upwards, The first extruded aluminum heat transfer module (1-A) is arranged on the top of the fully premixed fire row burner (6), and the top of the first extruded aluminum heat transfer module (1-A) is communicated through a connecting flue (7) The top of the second extruded aluminum heat transfer module (1-B) and the bottom of the second extruded aluminum heat transfer module (1-B) communicate with the dew receiving tray (3); When the extruded aluminum heat transfer module is installed and includes an extruded aluminum heat transfer module, the fully premixed fire row burner (6) is placed at the bottom of the boiler with the combustion head (6-5) facing upward, and the extruded aluminum heat transfer module is set in the fully premixed fire On the top of the row burner (6), the flue gas is discharged from the top of the extruded aluminum heat transfer module, and the dew plate (3) is not provided; when the full premixed fire row burner (6) is placed on the top and contains an extruded aluminum When the heat transfer module is used, the fully premixed fire row burner (6) is placed on the top of the modular extruded aluminum condensing boiler with the combustion head (6-5) facing down, and the extruded aluminum heat transfer module is set on the fully premixed fire. At the bottom of the row burner (6), the dew-receiving plate (3) is arranged below the extruded aluminum heat transfer module, the top of the gas is ignited, and the flue gas flows downward, enters the extruded aluminum heat transfer module, is cooled, condensed, and dew The pan (3) collects the condensate; when the full premixed fire row burner (6) is placed overhead and contains two extruded aluminum heat transfer modules, the full premixed fire row burner (6) is placed on top of the boiler and The combustion head (6-5) faces downward, the first extruded aluminum heat transfer module (1-A) is arranged below the fully premixed fire row burner (6), and the second extruded aluminum heat transfer module (1-B) ) is arranged under the first extruded aluminum heat transfer module (1-A), the dew receiving tray (3) is arranged under the second extruded aluminum heat transfer module (1-B), the top of the gas is ignited, and the flue gas is always downward flow, enter the first extruded aluminum heat transfer module (1-A) and the second extruded aluminum heat transfer module (1-B) successively to be cooled and condensed, and the dew receiving tray (3) collects the condensate; when fully premixed When the fire row burner (6) is placed on top and contains two extruded aluminum heat transfer modules, the fully premixed fire row burner (6) is placed on the top of the modular extruded aluminum condensing boiler and the combustion head (6- 5) Downward, the first extruded aluminum heat transfer module (1-A) is arranged at the bottom of the fully premixed fire row burner (6), and the bottom of the first extruded aluminum heat transfer module (1-A) is connected to the The channel (7) is connected to the bottom of the second extruded aluminum heat transfer module (1-B), the gas is ignited at the top, and the flue gas enters the first extruded aluminum heat transfer module downward. The heat module (1-A) is cooled, and after passing through the connecting flue (7), it turns 180 degrees and flows upward, and enters the second extruded aluminum heat transfer module (1-B) to be cooled and condensed. The top of the aluminum heat transfer module (1-B) is discharged from the boiler, and 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 includes two extruded aluminum heat transfer modules, the second-stage extrusion The working fluid of the pressed aluminum heat transfer module adopts boiler return water, heat pump evaporator circulating water or tap water.

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