CN112254342A - Combustion heat exchange assembly and gas combustion equipment with same - Google Patents

Abstract

The invention discloses a combustion heat exchange assembly and gas combustion equipment with the same. This burning heat transfer subassembly includes: the heat exchanger is internally provided with a heat exchange flow path; the catalytic combustor utilizes heat generated by catalytic combustion to radiate the heat exchanger, and the heat exchanger and the catalytic combustor are parallel and are arranged opposite to each other. According to the combustion heat exchange assembly, the heat exchanger and the catalytic combustor are arranged in parallel and oppositely, so that the heat radiation of catalytic combustion can be efficiently utilized, the heat exchange efficiency of the heat exchanger is improved, the emission of harmful substances is reduced, and the use efficiency of energy is improved.

Description

Combustion heat exchange assembly and gas combustion equipment with same

Technical Field

The invention relates to the field of water heaters, in particular to a combustion heat exchange assembly and gas combustion equipment with the same.

Background

The main combustion mode adopted by the gas water heater is flame combustion: the gas and the air are mixed and combusted in the combustion chamber, because the difference exists between the mixing process and the reaction rate, the combustion temperature of an air-sufficient area is high, oxygen and nitrogen in the air react to generate NOx pollutants, and an air-insufficient area is incompletely combusted, so that harmful substances such as CO, hydrocarbon, tar and the like can be generated. In addition, the gas radiation quantity of the flame in the flame combustion is small, the convection heat transfer is used as a main heat transfer mode, and the energy utilization rate is not high.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the above-mentioned problems in the prior art. Therefore, the invention provides a combustion heat exchange assembly which can improve the heat exchange efficiency of a heat exchanger.

The combustion heat exchange assembly according to the embodiment of the invention comprises: the heat exchanger is internally provided with a heat exchange flow path; the catalytic combustor utilizes heat generated by catalytic combustion to radiate the heat exchanger, and the heat exchanger and the catalytic combustor are parallel and are arranged opposite to each other.

According to the combustion heat exchange assembly, the heat exchanger and the catalytic combustor are arranged in parallel and oppositely, so that the heat radiation of catalytic combustion can be efficiently utilized, the heat exchange efficiency of the heat exchanger is improved, the emission of harmful substances is reduced, and the use efficiency of energy is improved.

According to some embodiments of the invention, the distance between the heat exchanger and the catalytic burner is 20mm to 70 mm.

According to some embodiments of the invention, the outer surface of the heat exchanger has a coating that improves absorption.

Further, the blackness of the coating is 0.9-0.98.

According to some embodiments of the invention, the heat exchanger comprises heat exchange tubes arranged in a single layer.

Further, the heat exchange tube has fins extending toward the catalytic combustor with gaps between adjacent fins.

Further, the gap ranges from 1mm to 4 mm.

Furthermore, a turning structure is arranged on the fin, and the turning structure and the fin are located on different planes.

According to some embodiments of the invention, a turn-up structure is provided on the fin, the turn-up structure being located in a different plane than the fin.

According to another aspect of the invention, the gas combustion equipment comprises the combustion heat exchange assembly.

Compared with the prior art, the advantages of the gas combustion equipment and the combustion heat exchange assembly are the same, and are not described again.

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.

Drawings

FIG. 1 is an exploded view of a gas combustion device;

FIG. 2 is a perspective view of a heat exchanger;

FIG. 3 is a front view of the heat exchanger;

FIG. 4 is a bottom view of the heat exchanger;

FIG. 5 is a perspective view of a fin;

FIG. 6 is a front view of the fin;

FIG. 7 is a schematic diagram of heat exchange.

Reference numerals:

the device comprises a combustion heat exchange assembly 10, a heat exchanger 1, a heat exchange pipe 11, a water inlet 111, a water outlet 112, fins 12, a turning structure 121, a plate-type turning 1211, an annular turning 1212, heat exchange pipe mounting holes 122, a heat exchange box 13, a catalytic combustor 2, a fan 20, a gas valve 30, a gas pipe 40, a premixing cavity 50, a preheating combustor 60, a combustion chamber 70, a smoke collecting hood 80 and a gas combustion device 100.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically connected, electrically connected or can communicate with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The combustion heat exchange assembly 10 according to an embodiment of the present invention is described in detail below with reference to fig. 1 to 7.

Referring to fig. 1-4, a combustion heat exchange assembly 10 may include: heat exchanger 1, catalytic combustor 2. The heat exchanger 1 is internally provided with a heat exchange flow path, the catalytic combustor 2 radiates the heat exchanger 1 by utilizing heat generated by catalytic combustion, and the heat exchanger 1 and the catalytic combustor 2 are parallel and are arranged oppositely.

Specifically, the fuel gas and the air can be flameless combusted in the catalytic combustor 2, the heat transfer from the catalytic combustor 2 to the outside is mainly infrared radiation, the wavelength of the heat transfer is 2-6 μm, a large amount of heat can be released, the flameless combustion initiation temperature is low, so that the NOx emission can be reduced, the flameless combustion can promote complete combustion, the combustion is stable and sufficient, the emission of harmful substances such as CO, hydrocarbon, tar and the like can be reduced, the noise generated by the flameless combustion is low, the working noise of the combustion heat exchange assembly 10 can be reduced, and the customer satisfaction is improved.

The heat exchanger 1 can absorb heat emitted from the catalytic combustor 2 and heat water in the heat exchange flow path to meet the requirement of a user for using hot water.

The heat exchange principle is shown in fig. 7, and two non-concave black surfaces a1 and a2 are randomly arranged, wherein the temperature of a1 is T1, and the temperature of a2 is T2. A micro-surface dA1 is taken from the surface of A1, a micro-surface dA2 is taken from the surface of A2, the distances between dA1 and dA2 are r, the included angle between the normal n1 of dA1 and the connecting lines of dA1 and dA2 is theta 1, and the included angle between the normal n2 of dA2 and the connecting lines of dA1 and dA2 is theta 2.

The amount of radiant heat transfer between black surfaces a1 and a2 is:

so the factors influencing radiation heat transfer are: surface temperatures of a1 and a2, geometric characteristics of the surfaces (area size, shape), relative position between the surfaces, radiative properties of the surfaces, and the medium between the surfaces.

The temperatures of the catalytic combustor 2 and the heat exchanger 1 are constant (Eb1 and Eb2 are constant), the shape and the radiation area of the catalytic combustor 2 are constant (a1 and a2 are constant), and the thermal efficiency of the water heater can be improved by reducing the distance between the heat exchanger 1 and the catalytic combustor 2 (r is small) and the parallel relationship therebetween (θ 1 is 0 and θ 2 is 0).

In a specific embodiment, the heat exchanger 1 is parallel to and directly faces the catalytic combustor 2, and θ 1 and θ 2 can be made 0 and 0, so as to increase the radiant heat transfer amount from the catalytic combustor 2 to the heat exchanger 1, thereby facilitating the heat exchanger 1 to absorb heat more sufficiently, improving the heat exchange efficiency of the combustion heat exchange assembly 10, and further facilitating the improvement of the use efficiency of energy.

According to the combustion heat exchange assembly 10 disclosed by the invention, the heat exchanger 1 and the catalytic combustor 2 are arranged in parallel and oppositely, so that the heat radiation of catalytic combustion can be efficiently utilized, the heat exchange efficiency of the heat exchanger 1 is improved, the emission of harmful substances is reduced, and the use efficiency of energy is improved.

The distance between the heat exchanger 1 and the catalytic burner 2 is 20mm-70mm, for example 30mm, and possibly 40 mm. When the distance between the heat exchanger 1 and the catalytic combustor 2 is less than 20mm, the heat exchanger 1 has the risk of being burnt out, and when the distance between the heat exchanger 1 and the catalytic combustor 2 is more than 70mm, the distance (r) between the heat exchanger 1 and the catalytic combustor 2 is too large, so that the radiation heat transfer efficiency is reduced.

In some embodiments, the outer surface of the heat exchanger 1 has a coating that improves absorption.

Specifically, the emissivity of infrared radiation of one material is high, the absorptivity is also high, the emissivity of infrared radiation on the inner surface of the heat exchanger 1 is lower, so that the temperature of water in the heat exchanger 1 is prevented from being dissipated, the emissivity and the absorptivity of infrared radiation of the coating are higher, the absorptivity and the emissivity of the heat exchanger 1 to infrared radiation are improved, a radiation field and a temperature field are uniform, the absorption and the transfer of heat are facilitated, and fuel is saved. The coating material can change infrared heating wave spectrum, improve the emissivity of the heat exchanger 1 in the 2um-6um wave band, strengthen the effective absorption of the radiation surface, thus is favorable for improving the heat exchange efficiency. After the coating is arranged on the outer surface of the heat exchanger 1, the heat exchanger 1 increases the heat absorption rate, so that the smoke exhaust temperature can be reduced, the heat taken away by smoke is reduced, and the heat utilization rate is improved.

Optionally, the blackness of the coating is 0.9-0.98, such as 9.5, the higher the blackness of the coating, the higher the absorptivity and emissivity of infrared radiation, and the suitable blackness of the coating can have both higher absorptivity and emissivity of infrared radiation and lower manufacturing cost.

As shown in fig. 1 to 4, the heat exchanger 1 may include heat exchange tubes 11 and a heat exchange case 13, and the heat exchange tubes 11 may be arranged in a single layer.

Specifically, the heat exchange tube 11 is arranged in the heat exchange box 13 in a bending manner, the heat exchange box 13 can fixedly support the heat exchange tube 11, the heat exchange tube 11 is provided with a water inlet 111 and a water outlet 112, cold water enters from the water inlet 111 and flows out from the water outlet 112 after being heated and warmed in the heat exchange tube 11, the heat exchange tube 11 can be arranged in a single layer manner, so that the surface area of the heat exchange tube 11 is increased, the radiant heat of the catalytic combustor 2 can be absorbed by the heat exchange tube 11 more, the heat exchange efficiency is improved, the time of the heat exchanger 1 for heating the cold water is shortened, and the.

In the embodiment shown in fig. 2-3, the heat exchange tubes 11 have fins 12 to increase the heat exchange area of the heat exchanger 1. Optionally, the fins 12 extend towards the catalytic burner 2 with gaps between adjacent fins 12.

In a specific embodiment, the fins 12 are provided with heat exchange tube mounting holes 122, as shown in fig. 5 to 6, the heat exchange tubes 11 are inserted into the heat exchange tube mounting holes 122 and connected with the fins 12, and the fins 12 face the catalytic combustor 2 to increase the heat exchange area, thereby reducing heat loss, being efficient and energy-saving, and meanwhile, the fins 12 can be closer to the catalytic combustor 2, so that the distance r between the heat exchanger 1 and the catalytic combustor 2 can be reduced to improve the heat exchange effect. The clearance between adjacent fin 12 can discharge the flue gas that the burning produced to be favorable to guaranteeing good combustion state, when the flue gas passes through fin 12 clearance, fin 12 and heat exchange tube 11 can absorb more flue gas heat, further improves heat exchanger 1's heat exchange efficiency.

The range of the gap between the adjacent fins 12 is 1mm-4mm, for example, 2mm, the fins 12 are closely arranged, the structure is compact, and more fins 12 can be installed in the heat exchanger 1 through the smaller gap between the adjacent fins 12, thereby being beneficial to improving the heat exchange efficiency of the combustion heat exchange assembly 10.

In some embodiments, not shown, a fin 12 may also be disposed on the side (i.e., upper side) of the heat exchange tube 11 facing away from the catalytic burner 2 to absorb heat of the flue gas after passing through the heat exchange tube 11.

As shown in fig. 5-6, the fins 12 are provided with turn-up structures 121, and the turn-up structures 121 are located on different planes from the fins 12.

In a specific embodiment, the height of the turning structure 121 may be 2mm, and the height of the turning structure 121 may be the same as the gap between two adjacent fins 12, so as to ensure that the gap between two adjacent fins 12 is consistent when the fins 12 are assembled, and the turning structure 121 may include: a plate-type flip 1211 and a ring-type flip 1212. The turn-up structure 121 near the catalytic burner 2 can be a plate-shaped turn-up 1211, the plate-shaped turn-up 1211 can increase the flow velocity of the flue gas, and the ring-shaped turn-up 1212 above the plate-shaped turn-up 1211 can generate turbulent motion to the flue gas, thereby being beneficial to prolonging the residence time of the flue gas in the heat exchanger 1 and further enhancing the heat exchange efficiency of the combustion heat exchange assembly 10. The turning structure 121 can also increase the heating area of the fins 12, so that the heat exchange tubes 11 can absorb more flue gas heat, the heat transfer efficiency of the combustion heat exchange assembly 10 is improved, and the heat exchange capacity is enhanced.

In some alternative embodiments, the hole structure at the ring-shaped turnover 1212 can be used as a mounting hole position for the fin 12, for example, a guide rod through hole structure can be used to fix the fin 12 on the heat exchange box 13.

The heat exchanger 1 is a copper heat exchanger or a stainless steel heat exchanger. Specifically, the heat exchanger 1 made of copper and stainless steel has excellent heat conductivity, corrosion resistance and high temperature resistance, so that the heat exchange efficiency of the combustion heat exchange assembly 10 can be improved, and the service life of the combustion heat exchange assembly 10 can be prolonged.

As shown in fig. 1, a gas combustion apparatus 100 according to another embodiment of the present invention includes the combustion heat exchange assembly 10 of the above embodiment.

Optionally, the gas combustion device 100 is a gas water heater or a gas wall-hanging stove. The gas combustion apparatus 100 may further include: the device comprises a fan 20, a gas valve 30, a gas pipe 40, a premixing cavity 50, a preheating burner 60, a combustion chamber 70 and a smoke collecting hood 80.

In the specific embodiment, the fan 20 provides air, the gas valve 30 controls the gas supply ratio, the gas enters the premixing cavity 50 through the gas pipe 40 and is mixed with the air, and then enters the combustion chamber 70, the preheating burner 60 and the catalytic burner 2 can be arranged in the combustion chamber 70, the mixed gas is ignited and combusted in the preheating burner 60 to heat the catalytic burner 2, when the temperature of the catalytic burner 2 reaches above 600 ℃, the air intake amount is increased to reach a certain de-firing line speed, and flameless catalytic combustion is realized on the catalytic burner 2. The heat exchanger 1 absorbs the heat generated by the catalytic combustor 2 to heat the water in the heat exchange tube 11, and the high-temperature tail gas after combustion is discharged from the smoke collecting hood 80 after heat exchange by the heat exchanger 1.

The preheating burner 60 is arranged opposite the catalytic burner 2, for example in the example of fig. 1, the preheating burner 60 is located below the catalytic burner 2, the preheating burner 60 being used for heating the catalytic burner 2. In some embodiments, not shown, the preheating burner 60 may be located above or to the side of the catalytic burner 2, provided that the catalytic burner 2 is located on the downstream side of the preheating burner 60 in the flow direction of the gas stream.

The preheating burner 60 heats the catalytic burner 2 to raise the temperature of the catalytic burner 2 to a suitable operating temperature range, thereby preventing excessive harmful gas from being generated due to insufficient gas combustion. The premixing cavity 50 discharges the air-gas mixture which is uniformly mixed to the preheating burner 60, so as to ensure good combustion effect.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.

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, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (10)

1. A combustion heat exchange assembly, comprising:

the heat exchanger is internally provided with a heat exchange flow path;

the catalytic combustor utilizes heat generated by catalytic combustion to radiate the heat exchanger, and the heat exchanger and the catalytic combustor are parallel and are arranged opposite to each other.

2. The combustion heat exchange assembly of claim 1, wherein the distance between the heat exchanger and the catalytic burner is 20mm to 70 mm.

3. The combustion heat exchange assembly of claim 1 wherein the outer surface of the heat exchanger has an absorption enhancing coating.

4. The combustion heat exchange assembly of claim 3, wherein the coating has a blackness of 0.9 to 0.98.

5. The combustion heat exchange assembly of claim 1, wherein the heat exchanger comprises heat exchange tubes arranged in a single layer.

6. The combustion heat exchange assembly of claim 5 wherein the heat exchange tubes have fins extending toward the catalytic burner with gaps between adjacent fins.

7. The combustion heat exchange assembly of claim 6, wherein the gap ranges from 1mm to 4 mm.

8. The combustion heat exchange assembly of claim 6, wherein the fins are provided with a turn-up structure, and the turn-up structure and the fins are located on different planes.

9. The combustion heat exchange assembly of claim 1, wherein the heat exchanger is a copper heat exchanger or a stainless steel heat exchanger.

10. A gas combustion device comprising a combustion heat exchange assembly according to any one of claims 1 to 9.

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