Energy-saving condensing boiler

Abstract

This invention discloses an energy-saving condensing boiler, characterized by: a furnace body having a furnace cavity, wherein a primary heat exchanger, a secondary heat exchanger, and burners are arranged within the furnace cavity; each set of burners and primary heat exchangers consists of two groups, with the two groups of burners respectively located on opposite sides below the furnace cavity, and each group of primary heat exchangers positioned outside one of the burners; the secondary heat exchanger is located above the two groups of primary heat exchangers; the furnace cavity also includes an upward-opening heat insulation mechanism, positioned above the two groups of primary heat exchangers, with the secondary heat exchanger located within the opening of the heat insulation mechanism, and positioned near the top of the opening; a flue gas passage is provided between the secondary heat exchanger and the bottom of the opening of the heat insulation mechanism. This invention saves energy, reduces costs, and minimizes space occupancy.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of boiler technology, in particular to an energy-saving condensing boiler. BACKGROUND

[0002] The condensing boiler has the characteristics of high efficiency, energy saving and environmental protection, and is the development direction of the boiler industry. The condensing boiler is a high-efficiency condensing waste heat recovery device that absorbs the sensible heat in the high-temperature flue gas discharged by the boiler and the latent heat released by the condensation of water vapor to improve the thermal efficiency of the boiler.

[0003] In the industry convention, the power of the boiler is generally matched with the corresponding combustion system, for example, a 4-ton (2800KW) condensing boiler uses a 2800kw standard burner, that is, the tonnage of the boiler is divided by the corresponding power burner. Among them, taking an 8-ton boiler with a power of 5600kw as an example, a single burner is generally used, and under the existing technical level, the adjustment ratio of the burner can be 20% to 100%, which has been greatly improved compared with the two-stage or three-stage fire of the traditional boiler.

[0004] In the heating industry in China, when selecting a boiler, it needs to be considered that the boiler not only meets the heating demand in the severe cold stage, but also ensures that the boiler can operate stably under the condition of very low heating load at the beginning and end of heating, and does not appear the situation of frequent start and stop of the boiler due to too low load. In such applications, the boiler needs to have a larger load adjustment ratio. For the above-mentioned situation, there are generally two processing methods, one is to increase the adjustment ratio of the boiler combustion system, and the other is to use a multi-module boiler combination method (multiple tonnage boilers are combined together). The multi-module combination will increase the initial equipment investment cost to some extent, and the installation space requirement is also larger, and the adjustment ratio of the boiler combustion system is not easy to adjust. Therefore, how to solve the above technical problems is the direction that the technical personnel in the field need to strive for. SUMMARY

[0005] The purpose of the present application is to provide an energy-saving condensing boiler, which is more energy-saving, reduces the maintenance rate, prolongs the service life, and at the same time, can also reduce the space occupied by the boiler.

[0006] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is: an energy-saving condensing boiler, comprising a furnace body with a furnace cavity, a primary heat exchanger, a secondary heat exchanger and a burner are arranged in the furnace cavity,

[0007] Two groups of burners are arranged on the two sides below the furnace cavity, and each group of primary heat exchangers is arranged outside each group of burners;

[0008] The secondary heat exchanger is arranged above the two groups of primary heat exchangers;

[0009] The furnace cavity is further provided with an upwardly open heat insulation mechanism arranged above the two groups of primary heat exchangers, the secondary heat exchanger is arranged in the opening of the heat insulation mechanism, and the secondary heat exchanger is arranged close to the top of the opening.

[0010] The secondary heat exchanger and the bottom of the opening of the heat insulation mechanism have a smoke exhaust channel.

[0011] In the above technical solution, the furnace cavity below the heat insulation mechanism is further provided with a partition plate, the two ends of the partition plate are respectively connected with the inner walls of the furnace cavity, and the two sides of the partition plate respectively form independent furnace cavities, and each group of burners and primary heat exchangers are arranged in an independent furnace cavity.

[0012] In the above technical solution, each side of the heat insulation mechanism forms a connecting channel with the corresponding side wall of the furnace cavity, and a top channel is formed between the heat insulation mechanism and the top of the furnace cavity, and the top channel is connected with the two independent furnace cavities through the two connecting channels.

[0013] The high-temperature flue gas generated by the burners in the independent furnace cavities passes through the primary heat exchangers, the connecting channels, the top channels and the secondary heat exchangers in sequence and then enters the smoke exhaust channel.

[0014] In the above technical solution, the heat insulation mechanism is arranged along the axis direction of the burners, the heat insulation mechanism includes a hollow partition plate, the inside of the hollow partition plate is provided with a closed hollow interlayer, the two sides of the hollow interlayer are respectively provided with an air inlet and an air outlet communicated with the hollow interlayer, and the air inlet and the air outlet are respectively connected with the outer wall of the furnace body.

[0015] In the above technical solution, a fan connected with the air inlet of the burner is further arranged outside the furnace body, and the air outlet of the hollow interlayer is connected with the air inlet of the fan.

[0016] In the above technical solution, the hollow partition plate includes a V-shaped plate and vertical plates arranged on the two sides of the V-shaped plate, the V-shaped plate includes two inclined plates arranged upwardly and obliquely from the middle part to the side part, the inner ends of the two inclined plates are connected, the bottoms of the two vertical plates are respectively connected with the outer ends of the two inclined plates, and the hollow interlayer is arranged in the vertical plates and the inclined plates.

[0017] In the above technical solution, the secondary heat exchanger is arranged above the V-shaped plate between the two vertical plates, the secondary heat exchanger is arranged close to the top of the vertical plate, and the smoke exhaust channel is arranged between the secondary heat exchanger and the V-shaped plate.

[0018] In the technical scheme, the length of the secondary heat exchanger is less than the length of the first heat exchanger, the front end of the secondary heat exchanger is arranged directly above the front end of the first heat exchanger, and the rear end of the secondary heat exchanger is arranged above the middle part of the first heat exchanger.

[0019] The furnace body is externally provided with a chimney, the chimney is arranged outside the furnace body at the rear end of the secondary heat exchanger, and the chimney is in communication with the rear end of the flue.

[0020] In the technical scheme, the furnace body is externally provided with a water pipe for supplying water to the first heat exchanger and the secondary heat exchanger, and the water supplied by the water inlet of the water pipe is sequentially discharged through the secondary heat exchanger, the first heat exchanger and the water outlet of the water pipe.

[0021] In the technical scheme, the first heat exchanger comprises inner circle heat exchange pipes and outer circle heat exchange pipes arranged around the inner circle heat exchange pipes, the inner circle heat exchange pipes have accommodating cavities, and the burners are arranged in the accommodating cavities.

[0022] The secondary heat exchanger comprises multiple rows of secondary heat exchange pipes arranged in intervals from top to bottom.

[0023] Compared with the prior art, the application has the following advantages due to the technical scheme:

[0024] 1. In the application, two groups of burners are arranged in the furnace body, the two groups of burners can be used simultaneously or individually, so that the power of the boiler can be adjusted smaller, energy consumption can be further saved, cost can be reduced, the frequent start and stop of the boiler can be prevented, the maintenance rate can be reduced, and the service life of the burners can be prolonged.

[0025] 2. In the application, two groups of burners are arranged in one boiler, so that the load adjustment ratio of the boiler can be increased, the cost of the equipment can be reduced, the procurement cost of the user can be reduced, the structure of the boiler is more compact, and the demand for installation space is reduced.

[0026] 3. In the application, a heat insulation mechanism is arranged between the first heat exchanger and the secondary heat exchanger, so as to ensure sufficient heat exchange between the flue gas and the corresponding heat exchanger, and effectively ensure the heat exchange effect.

[0027] 4. The hollow interlayer is arranged in the heat insulation mechanism in the application, the intake of the burner passes through the hollow interlayer, so that when the high-temperature flue gas contacts the heat insulation mechanism, the external cold air enters the hollow interlayer, the cold air is used to heat-insulate the high-temperature flue gas after passing through the primary heat exchanger, and a cooling effect is given to the heat insulation mechanism, heat dissipation is reduced, the heat exchange effect of the secondary heat exchanger is ensured, and the intake temperature of the burner can be preheated, so that the effect of the air preheater is achieved, the energy consumption of the subsequent burner combustion is reduced, and the cost is reduced;

[0028] 5. The high-temperature flue gas passes through the primary heat exchanger and then flows upwards and then downwards to pass through the secondary heat exchanger, so that the resistance of the flue gas backflow is increased, and the influence of the flue gas backflow on heat exchange and condensation is prevented.

[0029] 6. The partition plate is arranged between the two groups of burners to separate them, so that the influence of one group of burners on the other group of burners is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a structural schematic view of the embodiment one of the application;

[0031] Figure 2 is a left view of Figure 1 ;

[0032] Figure 3 is a left view of 2;

[0033] Figure 4 is a perspective structural schematic view of Figure 1 ;

[0034] Figure 5 is a perspective structural schematic view of Figure 3 ;

[0035] Figure 6 is a sectional view structural schematic view of A-A in Figure 2 (the arrow is the flue gas flow path direction generated by the burner);

[0036] Figure 7 is a sectional view structural schematic view of B-B in Figure 3 (the arrow is the flue gas flow path direction generated by the burner).

[0037] The components are: 1. Furnace cavity; 2. Furnace body; 3. Primary heat exchanger; 4. Secondary heat exchanger; 5. Burner; 6. Insulation mechanism; 7. Exhaust duct; 8. Water pipe; 9. Baffle plate; 10. Independent furnace cavity; 11. Connecting channel; 12. Top channel; 13. Chimney; 14. Hollow baffle plate; 15. Hollow interlayer; 16. Burner air inlet; 17. V-shaped plate; 18. Vertical plate; 19. Inclined plate; 20. Inner ring heat exchange tube; 21. Outer ring heat exchange tube; 22. Secondary heat exchange tube. Detailed Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0039] Example 1: See Figures 1 to 7 As shown, an energy-saving condensing boiler includes a furnace body 2 with a furnace cavity 1. The furnace cavity is equipped with a primary heat exchanger 3, a secondary heat exchanger 4, and a burner 5. Both the burner 5 and the primary heat exchanger 3 are in pairs.

[0040] The two sets of burners 5 are respectively arranged on both sides below the furnace cavity 1, and each set of primary heat exchangers 3 is arranged outside the set of burners 5.

[0041] The secondary heat exchanger 4 is positioned above the two sets of primary heat exchangers 3;

[0042] The furnace cavity 1 is also provided with an upward-opening heat insulation mechanism 6. The heat insulation mechanism 6 is located above the two sets of primary heat exchangers 3. The secondary heat exchanger 4 is located in the opening of the heat insulation mechanism 6, and the secondary heat exchanger 4 is located near the top of the opening.

[0043] There is a smoke exhaust channel 7 between the bottom of the opening of the secondary heat exchanger 4 and the insulation mechanism 6.

[0044] In this embodiment, taking the axial arrangement of the primary heat exchanger, secondary heat exchanger, and burner as an example, the primary heat exchanger, secondary heat exchanger, and burner are arranged in parallel, and the power of the two sets of burners is the same. Taking a total boiler power of 5600 kW as an example, the power of each burner is 2800 kW. In this way, when the room temperature is high and the power required by the condensing boiler is low, only one set of burners can be turned on, and the minimum power of this set of burners can be maintained at 560 kW. This results in a lower lower limit of the adjustment ratio, enabling operation with lower energy consumption and reducing the problem of frequent start-stop (energy consumption is relatively high during the start-up process of the burner). This reduces the problems of easy damage, high maintenance rate, and short lifespan caused by frequent start-stop of the burner, while saving energy and reducing costs.

[0045] Meanwhile, in the embodiment, the two groups of burners can be controlled respectively, and can work independently or simultaneously. In the combustion process of the burners, high-temperature flue gas is generated. Since the high-temperature flue gas flows upward, the temperature of the flue gas is lowered after the flue gas passes through the primary heat exchanger, and then moves upward. When moving upward, the high-temperature flue gas first contacts the heat insulation mechanism, and is blocked by the heat insulation mechanism, so that the high-temperature flue gas can only flow upward from the heat insulation mechanism and the inner wall of the furnace cavity to the top of the furnace cavity. In this way, the high-temperature flue gas is above the heat insulation mechanism. Since the smoke exhaust channel is between the secondary heat exchanger and the bottom of the opening of the heat insulation mechanism, the high-temperature flue gas moves downward and flows into the opening of the heat insulation mechanism, and then is exhausted from the smoke exhaust channel. In the process of the high-temperature flue gas entering the smoke exhaust channel, the high-temperature flue gas passes through the secondary heat exchanger and is heat-exchanged by the secondary heat exchanger, so as to lower the temperature of the high-temperature flue gas. The flue gas with lowered temperature is exhausted from the smoke exhaust channel. The arrangement of the heat insulation mechanism can separate the temperature between the high-temperature flue gas flowing out of the primary heat exchanger and the flue gas flowing out of the secondary heat exchanger, so as to prevent the high-temperature flue gas from heating the low-temperature flue gas in the smoke exhaust channel again, and reduce the heat loss of the boiler. In the embodiment, the high-temperature flue gas sent by the burners first rises and then falls. In this process, the flue gas takes a detour, which can increase the resistance of the flue gas backflow, and prevent the flue gas backflow from causing the corrosion of the heat exchanger to be intensified when multiple boilers share a chimney.

[0046] The water pipe 8 outside the furnace body supplies water to the primary heat exchanger 3 and the secondary heat exchanger 4. The water supplied by the water inlet of the water pipe 8 is sequentially heat-exchanged by the secondary heat exchanger 4 and the primary heat exchanger 3, and is then exhausted through the water outlet of the water pipe 8. The water first passes through the secondary heat exchanger, and the water inside the secondary heat exchanger is preheated, and then enters the primary heat exchanger to be further heated (the temperature of the flue gas passing through the primary heat exchanger is higher than the temperature of the flue gas passing through the secondary heat exchanger), so as to improve the heat exchange effect.

[0047] Referring to Figure 6 The furnace cavity below the heat insulation mechanism 6 is further provided with a partition plate 9. The two ends of the partition plate 9 are connected to the inner walls of the furnace cavity 1, and the two sides of the partition plate 9 form independent furnace cavities 10. Each group of burners 5 and primary heat exchangers 3 is arranged in an independent furnace cavity 10.

[0048] In the embodiment, the partition plate is arranged to separate the two burners, so as to reduce the influence of the ignition of the burner in one independent furnace cavity on the burner in the other independent furnace cavity. Further, the front end and the rear end of the partition plate are connected with the inner wall of the furnace cavity respectively, the partition plate and the heat insulation mechanism have a spacing, the bottom of the partition plate and the bottom of the furnace cavity have a spacing, and the partition plate does not completely separate the two independent furnace cavities. Therefore, the partition plate can not only separate the two independent furnace cavities and reduce the influence of the ignition of the burner in one independent furnace cavity on the burner in the other independent furnace cavity, but also can communicate the two independent furnace cavities, so as to balance the air pressure and prevent the damage of the air pressure imbalance to the furnace body.

[0049] As shown in Figure 6 , each side of the heat insulation mechanism 6 is connected with the corresponding side wall of the furnace cavity 1 to form a connecting channel 11, and the top of the heat insulation mechanism 6 is connected with the top of the furnace cavity 1 to form a top channel 12. The top channel 12 is connected with the two independent furnace cavities 10 through the two connecting channels 11 respectively.

[0050] The high-temperature flue gas generated by the burner 5 in the independent furnace cavity passes through the primary heat exchanger 3, the connecting channel 11, the top channel 12, and the secondary heat exchanger 4 in sequence and then enters the smoke exhaust channel 7.

[0051] In the embodiment, the independent furnace cavity, the connecting channel, the top channel, the secondary heat exchanger, and the smoke exhaust channel form a flue gas flow channel. Therefore, the high-temperature flue gas generated by the burner passes through the primary heat exchanger for high-temperature heat exchange first. Due to the limitation of the partition plate, the heat insulation mechanism, and the inner wall of the furnace cavity, the high-temperature flue gas can only flow upwards from the connecting channel. When the high-temperature flue gas flows to the top channel, one end of the smoke exhaust channel has a chimney which is connected with the outside. Therefore, the high-temperature flue gas can only flow into the smoke exhaust channel after passing through the secondary heat exchanger and then be exhausted from the chimney.

[0052] Further, as shown in Figure 7 , the length of the secondary heat exchanger 4 is less than that of the primary heat exchanger 3. The front end of the secondary heat exchanger 4 is arranged above the front end of the primary heat exchanger 3, and the rear end of the secondary heat exchanger 4 is arranged above the middle of the primary heat exchanger 3.

[0053] As shown in Figure 5 , 6 , the furnace body is provided with a chimney 13 which is arranged outside the furnace body 2 at the rear end of the secondary heat exchanger 4 and is connected with the rear end of the smoke exhaust channel 7.

[0054] In the embodiment, the length of the secondary heat exchanger is less than that of the primary heat exchanger, and the chimney is upward, so as to reduce the space occupation of the boiler.

[0055] Referring to Figure 6 As shown in the figure, the heat insulation mechanism 6 is arranged along the axis direction of the burner 5, and comprises a hollow partition plate 14, the inside of which is provided with a closed hollow interlayer 15, and the two sides of the hollow interlayer 15 are respectively provided with an air inlet and an air outlet which are in communication with the hollow interlayer 15, and the air inlet and the air outlet are in communication with the outer wall of the furnace body 2.

[0056] The furnace body 2 is further provided with a fan (not shown in the figure) connected with the air inlet 16 of the burner, and the air outlet of the hollow interlayer 15 is connected with the air inlet of the fan.

[0057] In the embodiment, if the heat insulation mechanism only uses a simple partition plate or a partition plate made of a simple heat insulation material, although it plays a heat insulation role, it will still play a certain heat conduction role, thereby causing waste of heat. Therefore, in the embodiment, the hollow interlayer is arranged in the hollow partition plate, the air inlet is in communication with the outside, and the air outlet is connected with the fan. In this way, when the burner burns, the fan blows the fuel and the air transported through the hollow interlayer into the burner to mix and burn. In the process of burning of the burner, the outside air enters the hollow interlayer through the air inlet of the hollow interlayer, and is then sent out by the fan. In the process of flowing of the outside air in the hollow interlayer, the high-temperature flue gas will contact the hollow partition plate, so that the high-temperature flue gas preheats the air entering the hollow interlayer, so that the temperature of the air entering the burner is increased. The air with increased temperature enters the burner, so that the energy consumption for heating the air when the fuel burns can be reduced, thereby saving energy consumption and reducing cost. In the embodiment, the arrangement of the hollow interlayer and the air flowing in the hollow interlayer can not only play a heat insulation role, but also preheat the air entering the burner by using the high-temperature flue gas inside, thereby saving energy consumption and reducing cost.

[0058] Referring to Figure 6 As shown in the figure, the hollow partition plate comprises a V-shaped plate 17 and vertical plates 18 arranged on the two sides of the V-shaped plate 17, the V-shaped plate 17 comprises two inclined plates 19 which are arranged to be inclined upward from the middle part to the side part, the inner ends of the two inclined plates 19 are connected, and the bottoms of the two vertical plates 18 are respectively connected with the outer ends of the two inclined plates 19, and the hollow interlayer 15 is arranged in the vertical plates 18 and the inclined plates 19.

[0059] The secondary heat exchanger is arranged above the V-shaped plate between the two vertical plates, and the secondary heat exchanger is arranged close to the top of the vertical plate, and the flue gas passage is arranged between the secondary heat exchanger and the V-shaped plate.

[0060] The top of the partition plate is close to the middle of the bottom surface of the V-shaped plate, so that a Y-shaped structure is formed between the partition plate and the hollow partition plate, the secondary heat exchanger is arranged in the opening at the top of the Y-shaped structure, and the two groups of burners and the primary heat exchanger are arranged on the two sides of the Y-shaped structure, thereby separating the two groups of burners and the primary heat exchanger and reducing the influence of the ignition of a single group of burners on the other group of burners.

[0061] Referring to Figure 6 As shown in the figure, the primary heat exchanger comprises inner circle heat exchange pipes 20 and outer circle heat exchange pipes 21 arranged around the inner circle heat exchange pipes, the inner circle heat exchange pipes have accommodating cavities, and the burners are arranged in the accommodating cavities.

[0062] The secondary heat exchanger comprises multiple rows of secondary heat exchange pipes 22 arranged in a spaced manner from top to bottom, in this embodiment, the secondary heat exchanger comprises five rows of secondary heat exchange pipes arranged in a spaced manner from top to bottom, and each row of secondary heat exchange pipes comprises multiple heat exchange pipes arranged in a transverse spaced manner.

[0063] In this embodiment, the inner circle heat exchange pipes are multiple, and the multiple inner circle heat exchange pipes are arranged in a ring structure, and the outer circle heat exchange pipes are multiple, and the multiple outer circle heat exchange pipes are arranged in a ring structure.

[0064] The high-temperature flue gas first passes through the inner circle heat exchange pipes, and then passes through the outer circle heat exchange pipes, so that the inner circle heat exchange pipes and the outer circle heat exchange pipes can be used for primary heat exchange, and the multiple rows of secondary heat exchange pipes can be used for secondary heat exchange, so as to utilize the temperature of the flue gas as much as possible to improve the heat exchange effect.

[0065] Meanwhile, in the present application, the power of the condensing boiler is the sum of the power of the two groups of burners, and the burners can be cylindrical water-cooled burners, metal fiber mesh surface burners, or other types of burners.

[0066] In the description of the present application, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only used for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0067] In the present application, unless specifically defined and limited otherwise, the terms "mounting", "connection", "linking", "fixing" and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, for example, two mechanical abutting or touching connection modes formed by abutting, touching and the like, two elements can also be directly hung or hung through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

Claims

1. An energy saving condensing boiler characterised in that: The application relates to a furnace body with a furnace cavity, wherein a primary heat exchanger, a secondary heat exchanger and burners are arranged in the furnace cavity, the burners and the primary heat exchanger are arranged in two groups, The two groups of burners are arranged on the two sides below the furnace cavity, and the primary heat exchanger is arranged outside the burners. The secondary heat exchanger is arranged above the primary heat exchanger. A heat insulation mechanism is arranged in the furnace cavity, the heat insulation mechanism is arranged above the primary heat exchanger, the secondary heat exchanger is arranged in the opening of the heat insulation mechanism, and the secondary heat exchanger is arranged close to the top of the opening. The secondary heat exchanger and the bottom of the opening of the heat insulation mechanism are connected through a smoke exhaust channel. A partition plate is arranged in the furnace cavity below the heat insulation mechanism, the two ends of the partition plate are connected with the inner walls of the furnace cavity, and the two sides of the partition plate form independent furnace cavities. Each side of the heat insulation mechanism is connected with the corresponding side wall of the furnace cavity through a connecting channel, and the top of the heat insulation mechanism is connected with the top of the furnace cavity through a top channel. The high-temperature smoke generated by the burners in the independent furnace cavities passes through the primary heat exchanger, the connecting channel, the top channel and the secondary heat exchanger in sequence and then enters the smoke exhaust channel. The heat insulation mechanism is arranged along the axis direction of the burners, the heat insulation mechanism comprises a hollow partition plate, a closed hollow interlayer is arranged in the hollow partition plate, air inlets and air outlets are arranged on the two sides of the hollow interlayer and are connected with the hollow interlayer, and the air inlets and the air outlets are connected with the outer wall of the furnace body. A fan is arranged outside the furnace body and is connected with the air inlets of the burners, and the air outlets of the hollow interlayer are connected with the air inlets of the fan.

2. The condensing boiler of claim 1, wherein: The hollow partition plate comprises V-shaped plates and vertical plates arranged on the two sides of the V-shaped plates, the V-shaped plates comprise two inclined plates arranged upwards from the middle to the side, the inner ends of the two inclined plates are connected, the bottoms of the vertical plates are connected with the outer ends of the inclined plates, and the hollow interlayer is arranged in the vertical plates and the inclined plates.

3. The condensing boiler of claim 2, wherein: The secondary heat exchanger is arranged above the V-shaped plates between the two vertical plates, and the secondary heat exchanger is arranged close to the top of the vertical plates.

4. The condensing boiler of claim 1, wherein: The length of the secondary heat exchanger is smaller than that of the primary heat exchanger, the front end of the secondary heat exchanger is arranged above the front end of the primary heat exchanger, and the rear end of the secondary heat exchanger is arranged above the middle of the primary heat exchanger. A chimney is arranged outside the furnace body, the chimney is arranged outside the furnace body and is connected with the rear end of the smoke exhaust channel.

5. The condensing boiler of claim 1, wherein: Water pipes are arranged outside the furnace body and supply water to the primary heat exchanger and the secondary heat exchanger, and the water supplied by the water inlets of the water pipes passes through the secondary heat exchanger and the primary heat exchanger in sequence and is discharged through the water outlets of the water pipes.

6. The condensing boiler of claim 1, wherein: The primary heat exchanger comprises inner circle heat exchange pipes and outer circle heat exchange pipes arranged at the periphery of the inner circle heat exchange pipes, the inner circle heat exchange pipes have accommodating cavities, and the combustor is arranged in the accommodating cavities; The secondary heat exchanger comprises multiple rows of secondary heat exchange pipes arranged in intervals from top to bottom.

Images