Combustion heat exchange assembly and gas combustion device having the same

Abstract

This invention discloses a combustion heat exchange assembly and a gas combustion device having the same. The combustion heat exchange assembly includes a heat exchange chamber, a heat exchanger, and a catalytic burner. The heat exchange chamber has an inlet side and an outlet side. The heat exchanger is disposed within the heat exchange chamber, and the catalytic burner is disposed within the heat exchange chamber and utilizes the heat generated by catalytic combustion to radiate heat to the heat exchanger. The catalytic burner includes a carrier, on which a catalyst is disposed. The catalyst is coated on the surface of the carrier in a manner that does not completely cover the carrier. According to the combustion heat exchange assembly of this invention, by coating the surface of the carrier with the catalyst in a manner that does not completely cover the carrier, not only can the amount of catalyst used be effectively reduced, thereby significantly reducing the cost of the catalytic burner, but the effect of the catalyst can also be maximized, ensuring that the catalytic burner can perform normal catalytic combustion, thus ensuring the normal operation of the combustion heat exchange assembly.

Description

Technical Field

[0001] This invention relates to the field of water heater technology, and more specifically, to a combustion heat exchange component and a gas combustion device having the same. Background Technology

[0002] A gas water heater is a device that heats cold water by burning gas. Currently, most gas water heaters use flame combustion, which is not only inefficient in energy utilization but also emits many pollutants, such as CO (carbon monoxide) and NOx (nitrogen oxides). Therefore, replacing traditional inefficient combustion methods with efficient and clean combustion methods can effectively improve energy efficiency and reduce the emission of harmful substances. Among these methods, catalytic combustion avoids the disadvantages of flame combustion, reduces pollutant emissions, and has advantages such as low ignition temperature, low energy consumption, and stable combustion, making it considered an ideal combustion method.

[0003] However, the catalysts in the current combustion heat exchange components are coated onto the surface of the carrier by a complete coating method. The catalysts are mainly active components of precious metals such as platinum, palladium, and rhodium. However, the resources of precious metals are limited, which leads to the high cost of catalytic burners, resulting in higher costs for gas water heaters, which is not conducive to production and sales. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the aforementioned technical problems in the prior art. To this end, the present invention proposes a combustion heat exchange assembly in which the catalyst in the catalytic burner is coated onto a carrier through a partial coating method, which not only ensures catalytic effect but also keeps the cost of the catalytic burner low.

[0005] The present invention also proposes a gas combustion device having the above-mentioned combustion heat exchange components.

[0006] According to an embodiment of the present invention, a combustion heat exchange assembly includes: a heat exchange cavity, a heat exchanger, and a catalytic burner. The heat exchange cavity has an inlet side and an outlet side. The heat exchanger is disposed in the heat exchange cavity. The catalytic burner is disposed in the heat exchange cavity and radiates heat generated by catalytic combustion to the heat exchanger. The catalytic burner includes a carrier, and a catalyst is disposed on the carrier. The catalyst is coated on the surface of the carrier in a manner that does not completely cover the carrier.

[0007] According to the combustion heat exchange assembly of the present invention, by coating the catalyst on the surface of the carrier in a manner that does not completely cover the carrier, the amount of catalyst used can be effectively reduced, thereby greatly reducing the cost of the catalytic burner. Moreover, the role of the catalyst can be maximized, ensuring that the catalytic burner can carry out catalytic combustion normally, thereby ensuring the normal operation of the combustion heat exchange assembly.

[0008] According to some embodiments of the present invention, the combustion heat exchange assembly further includes: a preheating burner, the preheating burner being disposed opposite to the catalytic burner, and the preheating burner being used at least to heat the catalytic burner.

[0009] According to some embodiments of the present invention, a gas channel is formed on the carrier, one end of the gas channel faces the inlet side and the other end of the gas channel faces the outlet side.

[0010] Furthermore, the catalyst is coated on a single surface of the carrier to form a single-sided coating, the single-sided coating facing either the inlet side or the outlet side.

[0011] Furthermore, the single-sided coating has an extended coating that extends into the gas channel.

[0012] Specifically, the extension height of the extended coating is less than the height of the gas channel.

[0013] Specifically, the catalyst is coated on two opposing surfaces of the carrier to form a double-sided coating, with one side of the double-sided coating facing the inlet side and the other side facing the outlet side.

[0014] Furthermore, the double-sided coating includes: a first coating and a second coating disposed opposite to each other, the first coating having a first extended coating extending into the gas channel, the second coating having a second extended coating extending into the gas channel, and the first extended coating and the second extended coating being spaced apart.

[0015] According to some embodiments of the present invention, the catalyst is a noble metal catalyst.

[0016] According to another embodiment of the present invention, a gas combustion device includes the combustion heat exchange component described above.

[0017] The advantages of the gas combustion device and the combustion heat exchange component mentioned above compared to the prior art are the same, and will not be repeated here.

[0018] Additional aspects and advantages of the 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

[0019] Figure 1 This is a schematic diagram of the combustion heat exchange assembly;

[0020] Figure 2 This is a schematic diagram of a first embodiment of a catalytic burner;

[0021] Figure 3 This is a schematic diagram of a second embodiment of a catalytic combustor;

[0022] Figure 4 This is a schematic diagram of the third embodiment of the catalytic burner.

[0023] Figure label:

[0024] Combustion heat exchange assembly 10, heat exchange chamber 1, heat exchange chamber 11, air inlet side 12, air outlet side 13, heat exchanger 2, catalytic burner 3, carrier 31, catalyst 32, single-sided coating 33, extended coating 331, first coating 34, first extended coating 341, second coating 35, second extended coating 351, preheating burner 4, gas passage 5. Detailed Implementation

[0025] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0026] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0027] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] The following is combined Figures 1-4 The combustion heat exchange assembly 10 according to an embodiment of the present invention will be described in detail.

[0029] Reference Figure 1 As shown, the combustion heat exchange assembly 10 according to an embodiment of the present invention may include: a heat exchange chamber 1, a heat exchanger 2 and a catalytic burner 3, wherein a heat exchange cavity 11 is formed inside the heat exchange chamber 1.

[0030] like Figure 1 As shown, the heat exchange chamber 11 has an air inlet side 12 and an air outlet side 13. The heat exchanger 2 is disposed in the heat exchange chamber 11. The catalytic burner 3 is disposed in the heat exchange chamber 11 and uses the heat generated by catalytic combustion to radiate heat exchanger 2 to heat the water in heat exchanger 2.

[0031] The catalytic burner 3 includes a carrier 31 on which a catalyst 32 is disposed. The catalyst 32 is coated on the surface of the carrier 31 in a manner that does not completely cover the carrier 31. That is, the heat exchange chamber 1 is a hollow cavity with a central cavity, which is the heat exchange chamber 11. The heat exchanger 2 and the catalytic burner 3 are both located in the heat exchange chamber 11. The heat exchange chamber 1 has an inlet side 12 and an outlet side 13. In a specific embodiment, such as... Figure 1 As shown, the air inlet side 12 is located below the heat exchange chamber 1, and the air outlet side 13 is located above the heat exchange chamber 1. The gas enters the heat exchange chamber 11 through the air inlet side 12. After combustion and heat release, the exhaust gas is discharged from the outside of the heat exchange chamber 1 through the air outlet side 13. Since the gas temperature is high, the air outlet side 13 is set above the air inlet side 12, which is conducive to exhausting the exhaust gas.

[0032] like Figure 1 As shown, the catalytic burner 3 is located in the heat exchange chamber 11 and can catalytically burn the gas. The heat released by the catalytic combustion can heat the heat exchanger 2. The heat exchanger 2 has a heat exchange flow path through which water flows, thereby heating the water in the heat exchanger 2 to ensure that the water temperature rises to meet the user's needs.

[0033] like Figure 1 In the illustrated embodiment, the combustion heat exchange assembly 10 includes a preheating burner 4, which is located below the catalytic burner 3. The catalytic burner 3 can be heated by the preheating burner 4, ensuring that the catalytic burner 3 reaches the catalytic combustion temperature. Both the catalytic burner 3 and the preheating burner 4 can perform combustion reactions on the fuel gas. The heat generated by the preheating burner 4 is used to raise the temperature of the catalytic burner 3, enabling the catalytic combustion reaction to occur within the catalytic burner 3, thereby ensuring that the catalytic burner 3 radiates heat to the heat exchanger 2. Furthermore, the catalytic burner 3 and the preheating burner 4 can simultaneously heat the cold water in the heat exchanger 2, ensuring that the combustion heat exchange assembly 10 can heat the water efficiently, meeting the user's hot water needs.

[0034] In embodiments not shown, the catalytic burner 3 can also be directly ignited and heated by the ignition mechanism. That is, when the combustion heat exchange component 10 is working, the ignition mechanism continuously heats the catalytic burner 3 until the catalytic combustion temperature of the catalytic burner 3 is reached, thereby ensuring that the catalytic burner 3 can heat the water in the heat exchanger 2.

[0035] Furthermore, such as Figure 1 As shown, the preheating burner 4 can be arranged opposite to the catalytic burner 3, and the preheating burner 4 is at least used to heat the catalytic burner 3. The preheating burner 4 is arranged between the intake side 12 and the catalytic burner 3, and the preheating burner 4 and the catalytic burner 3 are spaced apart from each other. In a specific embodiment, the gas entering from the inlet side 12 of the heat exchange chamber 11 first passes through the preheating burner 4. The preheating burner 4 can perform initial open flame combustion on the gas. The heat released from the preheating burner 4 can not only heat the cold water in the heat exchanger 2, but also preheat the catalytic burner 3, thereby ensuring that the catalytic burner 3 can perform catalytic combustion on the gas. The gas that has been burned by the preheating burner 4 is incompletely burned, that is, the gas is not fully burned. It then enters the catalytic burner 3, which contains a catalyst 32. The catalyst 32 can chemically react with the incompletely burned gas, thereby lowering the ignition point of the gas. Then, the incompletely burned gas is further burned in the burner, ensuring complete combustion of the gas. This ensures that the gas is oxidized and decomposed into CO2 (carbon dioxide) and H2O (water). The decomposed CO2 is discharged from the outlet side 13, thereby ensuring zero emission of harmful gases from the combustion heat exchange assembly 10.

[0036] Specifically, the catalyst 32 in the catalytic burner 3 is a precious metal, such as platinum, palladium, or rhodium, and this precious metal is coated on the outer surface of the carrier 31 of the catalytic burner 3. Under the action of the precious metal, the ignition temperature of the gas can be reduced to about 5°C, thereby effectively reducing the burner temperature of the catalytic burner 3. Therefore, during combustion, the production of NOx can be effectively suppressed. Furthermore, under the action of the catalyst 32, the combustion of the gas is more complete, thereby reducing CO emissions. At the same time, the catalyst 32 can oxidize CO to CO2, thus achieving the purpose of reducing harmful gas emissions. Of course, the catalyst 32 in the catalytic burner 3 can also be a non-metallic catalyst 32.

[0037] It should be noted that when the preheater 4 reaches a certain temperature, the open flame on the preheater 4 is extinguished, and the gas achieves self-sustaining flameless combustion on the catalytic burner 3. The heat released by the combustion of the catalytic burner 3 can maintain the ignition temperature required by the catalytic burner 3 itself, and heat the cold water flowing through the heat exchanger 2. The flameless combustion is relatively gentle and stable, and the noise is low, thus ensuring that the combustion heat exchange component 10 is more friendly to the external environment when it is working, and thus ensuring that the combustion heat exchange component 10 is more environmentally friendly, safe and comfortable to use.

[0038] like Figures 2-4 As shown, the catalyst 32 is disposed on the carrier 31 of the catalytic burner 3, and the catalyst 32 is coated on the surface of the carrier 31 in a manner that does not completely cover the carrier 31, that is, the catalyst 32 is coated on a portion of the surface of the carrier 31. Therefore, compared with the method of completely coating the surface of the carrier 31, the amount of catalyst 32 used can be greatly reduced. Since the catalyst 32 is expensive, this method of incomplete coating of the catalyst 32 is beneficial for cost saving. Furthermore, in a specific embodiment, when the gas passes through the catalytic burner 3, the gas can also undergo a catalytic reaction with the catalyst 32 on the carrier 31, lowering the ignition point of the gas and thus maximizing the effect of the catalyst 32.

[0039] In other words, although the catalyst 32 is coated on the surface of the carrier 31 in a way that does not completely cover the carrier 31, it does not prevent the gas from reacting with the catalyst 32 and thus prevent the catalytic burner 3 from performing catalytic combustion. Therefore, by coating the surface of the carrier 31 with the catalyst 32 in a way that does not completely cover the carrier 31, the cost of the catalytic burner 3 can be greatly reduced, thereby reducing the cost of the combustion heat exchange assembly 10. Furthermore, the normal operation of the catalytic burner 3 can be guaranteed, thereby guaranteeing the normal operation of the combustion heat exchange assembly 10.

[0040] According to the combustion heat exchange assembly 10 of the present invention, by coating the catalyst 32 on the surface of the carrier 31 in a manner that does not completely cover the carrier 31, the amount of catalyst 32 used can be effectively reduced, thereby greatly reducing the cost of the catalytic burner 3. Moreover, the role of the catalyst 32 can be maximized, ensuring that the catalytic burner 3 can carry out catalytic combustion normally, thereby ensuring the normal operation of the combustion heat exchange assembly 10.

[0041] Furthermore, such as Figures 2-4As shown, a gas channel 5 is formed on the carrier 31, with one end of the gas channel 5 facing the inlet side 12 and the other end facing the outlet side 13. In a specific embodiment, when the gas passes through the catalytic burner 3, the gas can flow through the gas channel 5, thereby increasing the probability of the gas coming into contact with the catalyst 32 on the carrier 31, thus enabling the gas to undergo sufficient catalysis and ensuring that the catalyst 32 plays its full role.

[0042] Furthermore, such as Figures 2-3 As shown, catalyst 32 is coated on a single surface of carrier 31 to form a single-sided coating 33, which faces either the inlet side 12 or the outlet side 13.

[0043] In the first embodiment, such as Figure 2 As shown, catalyst 32 is coated on a single surface of carrier 31 facing the gas outlet side 13, which can greatly reduce the amount of catalyst 32 used. In a specific embodiment, when the gas passes through the catalytic burner 3, when the gas flows from above the carrier 31, it will inevitably come into contact with the single-sided coating 33 of the carrier 31, thereby causing the gas to undergo a catalytic reaction, thereby achieving the purpose of lowering the ignition point of the gas and ensuring that the gas can undergo catalytic combustion.

[0044] In the second embodiment, as Figure 3 As shown, the catalyst 32 is coated on a single surface of the carrier 31 facing the air intake side 12, which can also greatly reduce the amount of catalyst 32 used. In a specific embodiment, when the gas passes through the catalytic burner 3, the gas will inevitably come into contact with the single-sided coating 33 of the carrier 31 when it flows from below the carrier 31, thereby causing the gas to undergo a catalytic reaction, thereby reducing the ignition point of the gas and ensuring that the gas can undergo catalytic combustion.

[0045] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0046] Furthermore, such as Figures 2-3 As shown, the single-sided coating 33 has an extended coating 331 extending into the gas channel 5, thereby increasing the contact area between the gas and the catalyst 32.

[0047] In the first embodiment, such as Figure 2As shown, the extended coating 331 of the single-sided coating 33 on the carrier 31 extends along the lower part of the gas channel 5. When the gas flows in the gas channel 5, it will inevitably pass through the gas channel 5. Therefore, the gas can undergo a catalytic reaction with the extended coating 331, thereby further improving the catalytic effect of the gas and ensuring that the gas can be completely burned when the catalytic burner 3 is performing catalytic combustion, thus reducing the emission of harmful gases.

[0048] In the second embodiment, as Figure 3 As shown, the extended coating 331 of the single-sided coating 33 on the carrier 31 extends along the top of the gas channel 5. When the gas flows in the gas channel 5, it will inevitably pass through the gas channel 5. Therefore, the gas can undergo a catalytic reaction with the extended coating 331, thereby further improving the catalytic effect of the gas and ensuring that the gas can be completely burned when the catalytic burner 3 is performing catalytic combustion, thus reducing the emission of harmful gases.

[0049] Specifically, such as Figures 2-3 As shown, the extension height of the extended coating 331 is less than the height of the gas channel 5, which can further reduce the amount of catalyst 32 used, and thus further reduce the cost of the catalytic burner 3.

[0050] Preferably, the length of the extended coating 331 does not exceed 1 / 3 of the length of the carrier 31, thereby maximizing the catalytic effect of the catalyst 32.

[0051] In the third embodiment, as Figure 4 As shown, catalyst 32 is coated on two opposing surfaces of carrier 31 to form a double-sided coating, with one side of the double-sided coating facing the inlet side 12 and the other side facing the outlet side 13. By coating catalyst 32 on the two opposing surfaces of carrier 31, when the gas flows in the catalytic burner 3, whether the gas flows from above carrier 31 or below gas channel 5, it will come into contact with the single-sided coating 33 of carrier 31, thereby causing a catalytic reaction in the gas, thus lowering the ignition point of the gas and ensuring that the gas can undergo catalytic combustion.

[0052] Furthermore, the double-sided coating may include: a first coating 34 and a second coating 35 disposed opposite to each other, such as... Figure 4As shown, the first coating 34 is located above the carrier 31, and the second coating 35 is located below the carrier 31. The first coating 34 has a first extended coating 341 extending into the gas channel 5, and the second coating 35 has a second extended coating 351 extending into the gas channel 5. This can increase the contact area between the gas and the catalyst 32. The first extended coating 341 and the second extended coating 351 are spaced apart, which can reduce the amount of catalyst 32 used, thereby reducing the cost of the catalytic burner 3.

[0053] Preferably, the lengths of the first extended coating 341 and the second extended coating 351 do not exceed 1 / 3 of the length of the carrier 31, thereby maximizing the catalytic effect of the catalyst 32.

[0054] It should be noted that, compared to the first and second embodiments, in the third embodiment, the amount of catalyst 32 coated in the third embodiment is significantly greater than that in the first and second embodiments. Therefore, the catalytic effect of the gas in the first and second embodiments is worse than that in the third embodiment. Consequently, the exhaust gases (CO and NO) emitted by the catalytic burner 3 in the first and second embodiments are less efficient. X The content of CO is slightly higher than that in the exhaust gas from the catalytic burner 3 in the third embodiment. Specifically, as shown in Table 1, the CO content emitted by the catalytic burner 3 in the first embodiment is 16 ppm, and the NO content is... X The CO content was 12 ppm in the second embodiment, and the CO content emitted by the catalytic burner 3 was 14 ppm, while the NO content was 12 ppm. X The content of [unspecified substance] was 13 ppm. In the third embodiment, the CO content emitted by the catalytic burner 3 was 10 ppm, and the NO content was [unspecified substance]. X The content was 8 ppm.

[0055] However, the cost of the catalytic burner 3 in the first and second embodiments is much lower than the cost of the catalytic burner 3 in the third embodiment.

[0056] Furthermore, the exhaust gas content of the first, second, and third embodiments is not significantly different from that of the catalytic burner with the surface of the carrier completely coated. In particular, the exhaust gas content of the catalytic burner 3 in the third embodiment is almost the same as that of the catalytic burner with the surface of the carrier completely coated. Specifically, as shown in Table 1, the CO content of the catalytic burner with the surface of the carrier completely coated is 9 ppm, and the NO content is... X The content was 8 ppm.

[0057] Table 1. Comparison of harmful gas emissions from the three examples and the catalytic burner with fully coated catalyst.

[0058]

[0059] However, in the third embodiment, the cost of the catalytic burner 3 is far lower than that of the catalytic burner that is coated on the surface of the carrier in a manner that completely covers the carrier.

[0060] According to another embodiment of the present invention, a gas combustion device includes the combustion heat exchange assembly 10 described above. In this gas combustion device, the catalyst 32 in the combustion heat exchange assembly 10 is coated on the surface of the carrier 31 by means of incompletely covering the carrier 31, and... Figures 2-4 The coating method can maximize the effect of the precious metal catalyst 32, reduce the amount of precious metal used, extend the life of the catalyst 32, and reduce the cost of the catalytic burner 3.

[0061] Specifically, the gas combustion equipment can be a gas water heater or a gas wall-hung boiler.

[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0063] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A combustion heat exchange assembly, characterized by, include: A heat exchange cavity is formed within the heat exchange cavity, which has an air inlet side and an air outlet side; A heat exchanger, wherein the heat exchanger is disposed within the heat exchange chamber; A catalytic burner is disposed within the heat exchange chamber and radiates heat generated by catalytic combustion to the heat exchanger. The catalytic burner includes a carrier on which a catalyst is disposed. The catalyst is coated on the surface of the carrier in a manner that does not completely cover the carrier. A gas channel is formed on the carrier, with one end of the gas channel facing the inlet side and the other end facing the outlet side; the catalyst is coated on two opposing surfaces of the carrier to form a double-sided coating, with one side of the double-sided coating facing the inlet side and the other side facing the outlet side. The double-sided coating includes: a first coating and a second coating disposed opposite to each other, the first coating having a first extended coating extending into the gas channel, the second coating having a second extended coating extending into the gas channel, and the first extended coating and the second extended coating being spaced apart; The lengths of the first and second extended coatings do not exceed 1 / 3 of the length of the carrier.

2. The combustion heat exchange assembly of claim 1, wherein, Also includes: A preheating burner is provided, which is disposed opposite to the catalytic burner and is used to heat the catalytic burner.

3. The combustion heat exchange assembly of claim 1, wherein, The catalyst is coated on a single surface of the carrier to form a single-sided coating, which faces either the inlet side or the outlet side.

4. The combustion heat exchange assembly according to claim 3, characterized in that, The single-sided coating has an extended coating that extends into the gas channel.

5. The combustion heat exchange assembly according to claim 4, characterized in that, The extension height of the extended coating is less than the height of the gas channel.

6. The combustion heat exchange assembly according to claim 1, characterized in that, The catalyst is a noble metal catalyst.

7. A gas combustion device, characterized in that, Includes the combustion heat exchange assembly according to any one of claims 1-6.

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