TWI820943B - High density heating system - Google Patents

Abstract

In a high density heating system of the present invention, a combustion device is combined with a thermal conductive body having a combusting region and a heat conducting region. The combusting region has a flow channel structure for efficiently increasing the retention time of high temperature waste gas, and the heat conducting region has pin fins for providing a thermodynamic cycle inside an engine so that heat transfer enhances. Therefore, the high density heating system is applicable in the biogas industry to realize the reuse of energy and the development of new energy.

Description

High density heating system

The present invention relates to a combustion system, in particular to a high-density heating system.

The chemical energy in the engine fuel is converted into thermal energy through the combustion process, and the thermal energy is converted into mechanical energy through the thermodynamic cycle. Among them, the Stirling Engine is an external combustion engine, which is a high-efficiency engine. It is an efficient energy conversion device, and can operate using various types of heat sources including renewable energy without using specific fuels. It has excellent thermal efficiency, and because the Stirling engine can operate without limiting the energy source , so it is gradually regarded as an important green energy technology.

The conventional Stirling engine uses a heat exchanger to absorb external heat sources, and heat pipes can be used to increase heat transfer efficiency. However, the heat exchanger is limited by the mechanical structure and weight. At the same time, although the heat pipe increases heat transfer efficiency, the cost is also much higher. , and it will also increase the engine failure volume, causing the engine efficiency to be relatively reduced. Currently, there is no device that can simultaneously use low-grade fuel and traditional gaseous fuel.

The output power of the Stirling engine is limited by the input heat transfer rate. Therefore, enhancing the heat transfer rate of the hot end can increase the output power of the engine. Therefore, how to design the hot end to increase its heat transfer rate is a crucial core technology. To improve the deficiencies of conventional knowledge, the present invention proposes a high-density heating system with a simple structure and combines a high-efficiency burner with a specially designed heat transfer end to reduce the thickness of the heat transfer end, thereby reducing thermal resistance, and adopts a special needle fin structure. , greatly improves heat transfer efficiency, and can also accept various low-level fuels.

The main purpose of the present invention is to provide a high-density heating system that combines a combustion device with a heat conductor so that the combustion device can delay the residence time of high-temperature exhaust gas in the combustion area of the heat conductor.

In order to achieve the above object, one embodiment of the present invention discloses a high-density heating system, which includes: a combustion device that burns a fuel to generate a waste gas; and a heat conductor disposed on one side of the combustion device, It includes: a combustion area, the combustion area is arranged on one side of the heat conductor, the combustion area has a plurality of flow channels, these flow channels receive and transmit the thermal energy of the exhaust gas; a heat conduction area, the combustion area Disposed on the other side of the heat conductor, the heat conduction area has a plurality of pin fins to conduct the heat energy evenly.

In a preferred embodiment, the flow channels include a first spiral fin and a second spiral fin, the first spiral fin and the second spiral fin are arranged oppositely, and, in the first spiral fin An accommodating space is formed between the fin and the second spiral fin, wherein the flow channels are configured according to Archimedean spirals.

In a preferred embodiment, the combustion device includes a contact surface, the contact surface has a plurality of holes, and the exhaust gas is transmitted to the flow channels through the holes.

In a preferred embodiment, the holes are arranged corresponding to the flow channels.

In a preferred embodiment, the contact surface is covered with the flow channels, so that the accommodation space of the flow channels forms a cavity for the exhaust gas to flow in the cavity and transfer the heat energy. to the heat transfer area.

In a preferred embodiment, the flow channels have an air outlet at one end away from the center of the combustion area for outputting the exhaust gas.

In a preferred embodiment, the combustion device is a flat flame burner or an infrared gas flame burner.

In a preferred embodiment, the fuel is a low calorific value fuel or a gaseous fuel.

In a preferred embodiment, the thickness of the thermal conductor is 0.3mm-1mm, and the material of the thermal conductor is stainless steel, carbon steel or iron alloy.

In a preferred embodiment, it is suitable for combination with the heating end of a Stirling engine.

The advantageous effect of the present invention is that it simply combines the combustion device with the heat conductor, and based on the special design of the heat conductor, the fuel can be burned efficiently in the semi-enclosed cavity formed in the combustion zone.

1: Combustion device

11: Contact surface

111:hole

12:Air inlet

2: Thermal conductor

21: Burning area

211:Flow channel

2111:First spiral fin

2112:Second spiral fin

2113:Air outlet

22:Thermal conduction area

221:Needle fin

C: Central block

The first figure: it is a schematic structural diagram of an embodiment of the present invention; the second figure: it is a schematic structural diagram of an embodiment of the present invention; the third figure: it is a partial structural schematic diagram of an embodiment of the present invention; and Figure 4: This is a partial structural schematic diagram of an embodiment of the present invention.

In order to make the above and/or other objects, effects, and features of the present invention more obvious and easy to understand, preferred embodiments are listed below and described in detail: Please refer to the first and second figures, which are one implementation of the present invention. Example structural diagram. As shown in the figure, the high-density heating system of the present invention includes: a combustion device 1 and a heat conductor 2, and is described in detail as follows: The combustion device 1 is used to output fuel. Furthermore, the combustion device 1 may include a contact surface 11. This contact surface is used to transmit exhaust gas to the heat conductor 2, and the contact surface 11 has a plurality of holes 111 through which the exhaust gas passes. These holes 111 are transmitted to the heat conductor 2, and the combustion device 1 includes an air inlet 12 for inputting fuel for combustion.

In one embodiment, the combustion device 1 is a flat flame burner or an infrared gas stove, but is not limited to this. The flat flame burner refers to a burner with a radial plane flame, which is composed of a swirler and a fire channel. , the fuel flows forward in a swirling flow through the cyclone, and enters the fire channel to start burning. At this time, it spreads around to form a disc-shaped plane flame with a uniform temperature field, which can prevent local overheating and pass the exhaust gas through the contact surface. The holes 111 of 11 are transmitted to the thermal conductor 2 .

Please refer to the third figure and the fourth figure together, which are partial structural schematic diagrams of an embodiment of the present invention. As shown in the figure, the heat conductor 2 is disposed on one side of the combustion device 1. Furthermore, the heat conductor 2 is disposed on the contact surface 11 of the combustion device 1. The heat conductor 2 includes a combustion area 21 and a heat conduction area 22. The combustion The area 21 is arranged on one side of the heat conductor 2, and the heat transfer area 22 is arranged opposite to the combustion area 21. The combustion area 21 has a plurality of flow channels 211. These flow channels 211 receive the exhaust gas and can transfer the heat energy of the exhaust gas. It is transmitted to the heat conduction area, and the heat conduction area 22 has a plurality of pin fins 221, and these pin fins are used to conduct heat energy evenly.

In one embodiment, the flow channels 211 include first spiral fins 2111 and second spiral fins 2112, and the first spiral fins 2111 and the second spiral fins 2112 are arranged opposite to each other and in the first An accommodating space is formed between the spiral fins 2111 and the second spiral fins 2112. The spacing between the first spiral fins 2111 and the second spiral fins 2112 is the same, and the flow channels 211 are arranged according to the Achievements. Archimedean configuration, and the number of spiral fins is set according to the number of flow channels 211. For example, 12 flow channels are composed of 12 spiral fins, but this is not limited.

In one embodiment, the combustion area 21 of the heat conductor 2 has a central block C in the center, which is connected to one end of all the first spiral fins 2111 and the second spiral fins 2112 respectively, and all the first spiral fins 2111 and the second spiral fins 2112 The other ends of the two spiral fins 2112 are connected to the periphery away from the center of the combustion area 21, so the flow channels 211 are arranged one by one by the spiral fins according to the same spacing, because all the first spiral fins 2111 and the second The length of the spiral fins 2112 is also the same, so each flow channel 211 is spiral-shaped, and its size is the same. Since the flow channel 211 is a spiral structure, its combustion path is smaller than that of a general non-curved flow channel. It is longer, which can delay the time that the exhaust gas stays in the flow channel 211, thereby improving the use efficiency of the heat energy of the exhaust gas.

Furthermore, since the combustion area 21 is composed of a plurality of first spiral fins 2111 and second spiral fins 2112, the mechanical strength of the heat conductor 2 is also enhanced, so that the thickness of the heat conductor 2 can be lower, thereby reducing the heat transfer rate. resistance, thus helping to improve the heat transfer rate of the thermal conductor 2.

In addition, each flow channel 211 has an independent accommodation space. Therefore, when the combustion device 1 covers the flow channels 211 with the contact surface 11, the accommodation spaces of the flow channels 211 will be formed separately. In the semi-enclosed cavity, the exhaust gas can stay in the cavity and be slowly discharged along the spiral flow channel. In this way, the overall temperature will be maintained stable and the temperature loss will be reduced.

For this reason, in order to achieve a better combustion effect, further, the holes 111 distributed on the contact surface 11 can be arranged according to the combustion area 21 of the heat conductor 2, that is, the holes 111 are arranged according to each flow channel. 211 is distributed, and the exhaust gas can be accurately transmitted through the holes 111 to the cavity composed of each flow channel 211. Furthermore, the holes 111 are closer to the central block C of the combustion area 21. Increase the distribution density of these holes 111, and conversely, reduce the distribution density of these holes 111 in the central block C that is farther away from the combustion area 21, that is, closer to the periphery of the heat conductor 2, so as to increase The time that the heat energy of the exhaust gas remains in the cavity, that is, the distance between each hole 111 is not equidistant, but is not limited to this.

Preferably, the minimum distance between each hole 111 is D, and D>1mm. Preferably, each distance presents a geometric sequence relationship, that is, the ratio of any adjacent distances is equal, so the first The formula for n spacings is Dn=D*r ^n-1 , where Dn is the nth spacing; D is the minimum spacing; r is the common ratio, that is, all spacings present this sequence form {D, D*r, D *r ² ,...,D*r ^n-1 }, and the common ratio is between 1.01-1.2. In one embodiment, the holes 111 in the central block C closest to the combustion area 21 have the smallest On the contrary, the holes 111 closer to the periphery of the thermal conductor 2 have the largest distance. For example, the distance between the first hole and the second hole is 1.01mm, and the distance between the second hole and the third hole is 1.0201mm (i.e. 1.01mm). *1.01), the distance between the third hole and the fourth hole is 1.030301mm (i.e. 1.0201mm*1.01), and so on, but not limited to this.

In one embodiment, the flow channels 211 have air outlets 2113 at one end away from the center of the combustion area 21. The air outlets 2113 are distributed around the periphery of the heat conductor 2 so that exhaust gas can be discharged through the air outlets 2113. The air outlets 2113 are The quantity is not limited and can be set according to needs, but is not limited to this.

In one embodiment, the surface of the thermal conductive area 22 is covered with pin fins 221. When the heat energy is transferred to the thermal conductive area 22, it will be evenly conducted to the heating end through the pin fins 221. Preferably, it can be applied At the heating end of the Stirling engine, it provides thermal circulation inside the Stirling engine and has the effect of efficient heat transfer.

In one embodiment, the fuel may be a low calorific value fuel or a gaseous fuel, wherein the low calorific value fuel refers to a gaseous fuel with a calorific value less than 1,460 kcal/Nm ³ , which is widely used in coal production, coal chemical industry, petrochemical industry, steel, In the production process of metallurgy, textile printing and dyeing and other industries, for example: blast furnace gas, converter gas, carbon black tail gas, etc., may also appear in the process of processing production and living waste, animal husbandry biogas or factory waste heat. Therefore, the present invention It can effectively use low-temperature combustion to generate heat to provide Stirling engine power generation. According to experimental results, when using a flat bottom plate combined with a general gas furnace for heating, the power generation power is 12W. On the contrary, using a high-density heating system for heating, the power generation The power is as high as 22W, which is an increase of about 80%, which shows its effectiveness.

In summary, the present invention is a high-density heating system that uses a combustion device combined with a heat conductor and has a simple structure. In addition to preheating unburned fuel to increase its temperature and flammability, it can also delay the combustion of high-temperature exhaust gases. The residence time in the area can stably burn low calorific value fuel and increase the flame temperature, and can evenly conduct heat energy through the needle fin structure of the heat conduction area, greatly improving the heat transfer efficiency, and can use low calorific value fuel or gaseous fuel at the same time, especially It is a variety of low-grade low calorific value fuels to control pollution emissions and purify the living environment, and is consistent with the purpose of the present invention.

However, the above are only preferred embodiments of the present invention, but they cannot be used to limit the scope of the present invention; therefore, any simple equivalent changes and modifications made based on the patent scope of the present invention and the content of the specification, All are still within the scope of the patent of this invention.

1: Combustion device

11: Contact surface

12:Air inlet

2: Thermal conductor

21: Burning area

211:Flow channel

Claims (8)

A high-density heating system, which includes: a combustion device including a contact surface with a plurality of holes, the combustion device is used to burn a fuel to generate a waste gas; and a heat conductor disposed on the combustion device On one side, it includes: a combustion area, the combustion area is arranged on one side of the heat conductor, the combustion area has a plurality of flow channels, these flow channels receive and transmit the thermal energy of the exhaust gas; and a heat conductor area, the combustion area is arranged on the other side of the heat conductor, and the heat conduction area has a plurality of pin fins to conduct the heat energy evenly; wherein the contact surface covers the flow channels and is transmitted through the holes The exhaust gas flows into the flow channels, so that the accommodation space of the flow channels forms a cavity for the exhaust gas to flow in the cavity and transfer the heat energy to the heat conduction area. The high-density heating system according to claim 1, wherein the flow channels include a first spiral fin and a second spiral fin, and the first spiral fin and the second spiral fin are arranged oppositely, Moreover, the accommodation space is formed between the first spiral fin and the second spiral fin, wherein the flow channels are configured according to Archimedean spirals. The high-density heating system according to claim 1, wherein the holes are arranged corresponding to the flow channels. The high-density heating system according to claim 1, wherein the flow channels have an air outlet at one end away from the center of the combustion area for outputting the exhaust gas. The high-density heating system according to claim 1, wherein the combustion device is a flat flame burner or an infrared gas furnace. The high-density heating system according to claim 1, wherein the fuel is low calorific value fuel or gaseous fuel. The high-density heating system according to claim 1, wherein the thickness of the thermal conductor is 0.3mm-1mm, and the material of the thermal conductor is stainless steel, carbon steel or iron alloy. The high-density heating system according to claim 1, which is suitable for combination with the heating end of a Stirling engine.