High efficiency plate exchanger gas-fired hot air furnace

Abstract

The utility model discloses a kind of high-efficiency plate exchange type gas hot air furnace, it is related to hot air furnace design field, including furnace body;The left part in the furnace body is provided with combustion chamber, the right side in combustion chamber is provided with heat insulation plate, heat insulation plate is fixedly installed in furnace body, and heat insulation plate right side and furnace body between constitute heat exchange cavity;Heat exchange cavity is fixedly installed with flue gas passage, one end of flue gas passage is connected with combustion chamber, and the other end of flue gas passage is set out of furnace body;First heat exchanger and second heat exchanger are connected in flue gas passage, and cold air inlet is formed in the right side of furnace body, hot air outlet is formed in the upper side of furnace body, and cold air inlet and hot air outlet are interconnected with heat exchange cavity, and the air volume in cold air inlet is output from hot air outlet after first heat exchanger and second heat exchanger;The setting of two heat exchangers of the utility model can increase the contact area of heat exchange, realize the effect of rapid heat exchange, guarantee the hot air output of gas hot air furnace.

Description

Technical Field

[0001] This utility model relates to the field of hot blast stove design, and in particular to a high-efficiency plate heat exchanger gas-fired hot blast stove. Background Technology

[0002] Gas-fired hot air furnaces are industrial thermal energy devices that use natural gas, coal gas, or other fuels. They are mainly used in industries such as metallurgy, machinery, building materials, and chemicals, covering processes such as material drying, heating, and waste gas treatment. Since their introduction to China in the 1970s, they have gradually replaced traditional electric and steam heat sources. Their core types are direct and indirect: direct furnaces generate high-temperature purified gas through fuel combustion that directly contacts the material, reducing fuel consumption by 50% compared to traditional methods, making them suitable for applications such as ceramic powder drying; indirect furnaces heat air through heat exchangers, meeting the high cleanliness requirements of industries such as food and pharmaceuticals.

[0003] The working principle of a gas-fired hot air furnace is to use the heat generated by the combustion of the burner to heat the air. Usually, heat exchange is achieved by the mutual heat transfer between the transported flue gas and the air to obtain heated air. For example, the prior art (publication number: CN222527947U, publication date: 2025.02.25) discloses a low-NOx environmentally friendly gas-fired hot air furnace, which improves combustion efficiency by optimizing the combustion structure and furnace design; improves thermal efficiency through multiple heat exchanges and waste heat recovery; and removes harmful substances from the flue gas through the design of the air preheater and flue gas exhaust channel.

[0004] The above scheme uses a structure with multiple heat exchange to heat the air, simulating the relevant functions of existing heat exchangers. However, these heat exchange structures have the disadvantage of small heat exchange area compared with heat exchangers, and their heat exchange efficiency is not high.

[0005] In the prior art, there are also schemes that use a single heat exchanger for heat exchange. For example, the prior art (announcement number: CN115406100B, announcement date: 2024.01.12) discloses an indirect heat exchange hot air furnace, which uses a single plate heat exchanger for heat exchange operation.

[0006] Since commercially available gas-fired hot air blowers typically use heat exchange structures or single heat exchangers to achieve air heat exchange, these methods suffer from low heat exchange efficiency, leading to easy heat loss. Therefore, it is necessary to design a high-efficiency plate heat exchanger gas-fired hot air furnace to solve this technical problem. Utility Model Content

[0007] To overcome the shortcomings mentioned above, this utility model provides a technical solution that can solve the above problems.

[0008] A high-efficiency plate heat exchanger gas-fired hot air furnace includes a furnace body; A combustion chamber is provided on the left side of the furnace body, and a heat insulation plate is provided on the right side of the combustion chamber. The heat insulation plate is fixedly installed in the furnace body, and a heat exchange cavity is formed between the right side of the heat insulation plate and the furnace body. A flue gas passage is fixedly installed inside the heat exchange cavity. One end of the flue gas passage is connected to the combustion chamber, and the other end of the flue gas passage extends out of the furnace body. The flue gas passage is connected to a first heat exchanger and a second heat exchanger. A cold air inlet is formed on the right side of the furnace body, and a hot air outlet is formed on the upper side of the furnace body. Both the cold air inlet and the hot air outlet are connected to the heat exchange cavity. The air volume in the cold air inlet passes through the first heat exchanger and the second heat exchanger and is output from the hot air outlet.

[0009] Furthermore: the first heat exchanger is located inside the cold air inlet, and the second heat exchanger is located inside the hot air outlet.

[0010] Furthermore, both the first and second heat exchangers are plate heat exchangers.

[0011] Furthermore, both the first and second heat exchangers are provided with a number of horizontal through slots and a number of vertical through slots, which are staggered from each other.

[0012] Furthermore, the flue gas passage is interconnected with several vertical slots of the first heat exchanger, and the flue gas passage is interconnected with several horizontal slots of the second heat exchanger.

[0013] Furthermore, the airflow in the cold air inlet passes through several horizontal slots of the first heat exchanger and several vertical slots of the second heat exchanger before being output from the hot air outlet.

[0014] Furthermore: the flue gas passage includes a first connecting cylinder, a diffusion passage, a first trapezoidal passage, a turning passage, a second trapezoidal passage, a square passage, and a second connecting cylinder; The first connecting cylinder is connected between the combustion chamber and the diffusion channel, the first trapezoidal channel is connected between the diffusion channel and the first heat exchanger, the turning channel is connected to the upper end of the first heat exchanger, the second trapezoidal channel is connected between the turning channel and the second heat exchanger, and the square channel is fixedly installed at the left end of the second heat exchanger. The square channel extends out of the furnace body through the second connecting cylinder.

[0015] Furthermore, the heat exchange cavity is formed with an insulation box on its outer periphery, the insulation box is fixedly installed in the furnace body, and an insulation gap is provided between the outer wall of the insulation box and the inner wall of the furnace body.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: the flue gas generated by combustion in the combustion chamber enters the flue gas channel, and the flue gas is cooled and output after passing through the first heat exchanger and the second heat exchanger. At this time, cold air is delivered in the cold air inlet. After passing through the first heat exchanger and the second heat exchanger, the cold air can exchange heat. That is, the heat of the flue gas will heat the cold air, and the cold air will cool the flue gas. The setting of two heat exchangers can increase the contact area for heat exchange, achieve the effect of rapid heat exchange, and ensure the hot air output of the gas-fired hot air furnace.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 This is a cross-sectional structural schematic diagram of the present invention; Figure 3 yes Figure 2 A structural diagram from another perspective; Figure 4 This is a schematic diagram of the structure of the horizontal and vertical through slots in the heat exchanger.

[0020] The diagram shows: 1. Furnace body; 2. Combustion chamber; 3. Heat insulation plate; 4. Heat exchange cavity; 5. Flue gas passage; 51. First connecting cylinder; 52. Diffusion channel; 53. First trapezoidal channel; 54. Turning channel; 55. Second trapezoidal channel; 56. Square channel; 57. Second connecting cylinder; 6. First heat exchanger; 7. Second heat exchanger; 8. Cold air inlet; 9. Hot air outlet; 10. Horizontal through slot; 11. Vertical through slot; 12. Heat insulation box; 13. Heat insulation gap. Detailed Implementation

[0021] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0022] The components of the present invention embodiments described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0023] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] like Figure 1-4 As shown, a high-efficiency plate heat exchanger gas-fired hot air furnace of this utility model includes a furnace body 1; A combustion chamber 2 is provided on the left side of the furnace body 1, and a heat insulation plate 3 is provided on the right side of the combustion chamber 2. The heat insulation plate 3 is fixedly installed in the furnace body 1, and the right side of the heat insulation plate 3 and the furnace body 1 form a heat exchange cavity 4. A flue gas passage 5 is fixedly installed inside the heat exchange cavity 4. One end of the flue gas passage 5 is connected to the combustion chamber 2, and the other end of the flue gas passage 5 extends out of the furnace body 1. The flue gas passage 5 is connected to a first heat exchanger 6 and a second heat exchanger 7. A cold air inlet 8 is formed on the right side of the furnace body 1, and a hot air outlet 9 is formed on the upper side of the furnace body 1. Both the cold air inlet 8 and the hot air outlet 9 are connected to the heat exchange cavity 4. The air volume in the cold air inlet 8 is output from the hot air outlet 9 after passing through the first heat exchanger 6 and the second heat exchanger 7.

[0027] The principle is as follows: the flue gas produced by combustion in combustion chamber 2 enters flue gas passage 5. After passing through the first heat exchanger 6 and the second heat exchanger 7, the flue gas is cooled and output. At this time, cold air is delivered in cold air inlet 8. After passing through the first heat exchanger 6 and the second heat exchanger 7, the cold air can exchange heat. That is, the heat of the flue gas will heat the cold air, and the cold air will cool the flue gas. The setting of two heat exchangers can increase the contact area for heat exchange, achieve the effect of rapid heat exchange, and ensure the hot air output of the gas-fired hot air furnace.

[0028] Furthermore: the first heat exchanger 6 is located inside the cold air inlet 8, and the second heat exchanger 7 is located inside the hot air outlet 9; this allows the airflow to pass precisely through the first heat exchanger 6 and the second heat exchanger 7 before being output, achieving a rapid heating effect.

[0029] Furthermore, both the first heat exchanger 6 and the second heat exchanger 7 are plate heat exchangers, which have a larger heat exchange area and better heat exchange effect.

[0030] Furthermore, both the first heat exchanger 6 and the second heat exchanger 7 are provided with a plurality of horizontal through slots 10 and a plurality of vertical through slots 11, which are staggered from each other; the horizontal through slots 10 and the vertical through slots 11 do not affect each other, and there will be no mixing of flue gas and cold air during the heat exchange process, thus ensuring the air quality of the hot air after heat exchange.

[0031] Furthermore, the flue gas passage 5 is interconnected with several vertical slots 11 of the first heat exchanger 6, and the flue gas passage 5 is interconnected with several horizontal slots 10 of the second heat exchanger 7; allowing the flue gas in the flue gas passage 5 to quickly enter the first heat exchanger 6 and the second heat exchanger 7 for heat exchange.

[0032] Furthermore, the airflow in the cold air inlet 8 passes through several horizontal slots 10 of the first heat exchanger 6 and several vertical slots 11 of the second heat exchanger 7 before being output from the hot air outlet 9; allowing the air input from the cold air inlet 8 to quickly enter the first heat exchanger 6 and the second heat exchanger 7 for heat exchange.

[0033] Furthermore: the flue gas passage 5 includes a first connecting cylinder 51, a diffusion passage 52, a first trapezoidal passage 53, a turning passage 54, a second trapezoidal passage 55, a square passage 56, and a second connecting cylinder 57; The first connecting cylinder 51 is connected between the combustion chamber 2 and the diffusion channel 52, the first trapezoidal channel 53 is connected between the diffusion channel 52 and the first heat exchanger 6, the turning channel 54 is connected to the upper end of the first heat exchanger 6, the second trapezoidal channel 55 is connected between the turning channel 54 and the second heat exchanger 7, and the square channel 56 is fixedly installed at the left end of the second heat exchanger 7. The square channel 56 extends out of the furnace body 1 through the second connecting cylinder 57. The first trapezoidal channel 53 and the second trapezoidal channel 55 ensure that the flue gas enters the first heat exchanger 6 and the second heat exchanger 7 evenly for heat exchange. The trapezoidal structure can also reduce the size of the equipment. The diffusion channel 52 can widen the flue gas conveying aperture, and the outer wall of the diffusion channel 52 can also heat the cold air to achieve the effect of accelerating heat exchange. The setting of the deflection channel 54 can change the conveying direction of the flue gas, making the equipment space design more reasonable and significantly reducing the size of the equipment while ensuring the dual heat exchangers.

[0034] Furthermore: the heat exchange cavity 4 is formed with an insulation box 12 on its outer periphery. The insulation box 12 is fixedly installed in the furnace body 1, and an insulation gap 13 is provided between the outer wall of the insulation box 12 and the inner wall of the furnace body 1. The insulation box 12 can be separated from the furnace body 1 through the insulation gap 13, thereby achieving a sufficient insulation effect and preventing heat loss to the surrounding air.

[0035] This embodiment does not impose any limitation on the shape, material, structure, etc. of this utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model shall fall within the protection scope of this utility model.

Claims

1. A high-efficiency plate heat exchanger gas-fired hot air furnace, comprising a furnace body; characterized in that: A combustion chamber is provided on the left side of the furnace body, and a heat insulation plate is provided on the right side of the combustion chamber. The heat insulation plate is fixedly installed in the furnace body, and a heat exchange cavity is formed between the right side of the heat insulation plate and the furnace body. A flue gas passage is fixedly installed inside the heat exchange cavity. One end of the flue gas passage is connected to the combustion chamber, and the other end of the flue gas passage extends out of the furnace body. The flue gas passage is connected to a first heat exchanger and a second heat exchanger. A cold air inlet is formed on the right side of the furnace body, and a hot air outlet is formed on the upper side of the furnace body. Both the cold air inlet and the hot air outlet are connected to the heat exchange cavity. The air volume in the cold air inlet passes through the first heat exchanger and the second heat exchanger and is output from the hot air outlet. Both the first and second heat exchangers are provided with a number of horizontal through slots and a number of vertical through slots, which are staggered from each other.

2. The high-efficiency plate heat exchanger gas-fired hot blast stove according to claim 1, characterized in that: The first heat exchanger is located inside the cold air inlet, and the second heat exchanger is located inside the hot air outlet.

3. A high-efficiency plate heat exchanger gas-fired hot blast stove according to claim 2, characterized in that: Both the first and second heat exchangers are plate heat exchangers.

4. A high-efficiency plate heat exchanger gas-fired hot blast stove according to claim 1, characterized in that: The flue gas passage is interconnected with several vertical slots of the first heat exchanger and with several horizontal slots of the second heat exchanger.

5. A high-efficiency plate heat exchanger gas-fired hot blast stove according to claim 1, characterized in that: The airflow from the cold air inlet passes through several horizontal slots of the first heat exchanger and several vertical slots of the second heat exchanger before being output from the hot air outlet.

6. A high-efficiency plate heat exchanger gas-fired hot blast stove according to claim 1, characterized in that: The flue gas passage includes a first connecting cylinder, a diffusion passage, a first trapezoidal passage, a turning passage, a second trapezoidal passage, a square passage, and a second connecting cylinder; The first connecting cylinder is connected between the combustion chamber and the diffusion channel, the first trapezoidal channel is connected between the diffusion channel and the first heat exchanger, the turning channel is connected to the upper end of the first heat exchanger, the second trapezoidal channel is connected between the turning channel and the second heat exchanger, and the square channel is fixedly installed at the left end of the second heat exchanger. The square channel extends out of the furnace body through the second connecting cylinder.

7. A high-efficiency plate heat exchanger gas-fired hot blast stove according to claim 1, characterized in that: The heat exchange cavity is surrounded by an insulation box, which is fixedly installed in the furnace body, and an insulation gap is provided between the outer wall of the insulation box and the inner wall of the furnace body.

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