TWI651875B - Thermal power module for waste heat recovery - Google Patents

Abstract

The utility model relates to a thermoelectric module for waste heat recovery power generation, which is used for installing a thermoelectric module device port of a boiler exhaust duct, and the structure comprises: a device part, having a device board and a module frame, the device board is provided with a receiving port; and the first The thermoelectric conversion part comprises a heat pipe part having an evaporation end and a condensation end; the hot surface aluminum plate, the condensation end of the heat pipes is co-inserted in the interior of the hot surface aluminum plate; and a pair of cold surface aluminum plates respectively covering the top surface of the hot surface aluminum plate and a bottom surface; and a plurality of thermoelectric wafers, wherein the hot ends of the respective thermoelectric chips are bonded to the hot aluminum plate, and the cold ends of the respective thermoelectric chips are attached to the cold aluminum plate for generating a current by using a temperature difference between the hot aluminum plate and the cold aluminum plate Wherein, the first thermoelectric conversion portion penetrates into the receiving port of the device board at the evaporation end, and is in contact with the high-temperature waste hot gas in the exhaust duct.

Description

Thermal power module for waste heat recovery

The invention relates to a thermoelectric module, in particular to a thermoelectric module applied to waste heat recovery power generation.

In recent years, due to the continuous improvement of the performance of thermoelectric materials in technology, and the greenhouse effect/carbon dioxide reduction in environmental protection issues, the use of thermoelectric conversion technology to further convert large amounts of waste heat recovery into electrical energy has generally been obtained in Japan, the United States, Europe, etc. The attention of advanced countries. Reuse of waste heat has increased the competitiveness of thermoelectric power generation. Some emerging applications such as waste heat from waste incineration, waste heat from steel mills, and use of waste heat from automobiles and engine exhausts for thermoelectric power generation are also underway to provide auxiliary power for automobiles.

As far as the heat source for thermoelectric generators is concerned, the types of heat energy that can be used in China are industrial thermal energy (such as industrial high/low-level temperature difference heat energy, waste heat energy, heat exchanger heat energy), and vehicle emission heat energy (such as fuel oil). Car heat), environmental heat (such as solar heat / hot spring geothermal), other heat (such as hot water temperature difference heat, residential appliances heat, other industry heat).

In the use of waste heat in the plant, other types of power generation technology are more efficient, but because they also need to operate in a higher temperature environment, they cannot be used in a working environment below 150 °C, while thermoelectric power can utilize medium and low temperature heat energy. temperature Differential power generation has become an important choice.

The main problem to be solved by the present invention is to utilize the high temperature characteristics of the waste heat gas discharged from the industrial boiler, and the use of the thermoelectric material in the temperature difference to generate the current, so that the high temperature waste heat gas can be recycled to generate energy for energy recovery. Effect.

In order to achieve the above object, the present invention discloses a pyroelectric module for waste heat recovery power generation, which is suitable for a boiler, and the boiler is connected with a exhaust pipe for discharging high-temperature waste hot gas, and a side wall of the exhaust pipe is provided with a connection with the exhaust pipe. The thermoelectric module device port of the internal space of the channel and the external space, the thermoelectric module device is disposed at the port of the thermoelectric module device, and the structure comprises: a device portion having a device board and a module frame, the device board is provided with a capacity a port, the depth of the module frame can be accommodated in the inner space of the exhaust duct; and a first thermoelectric conversion portion, comprising: a heat pipe portion, which is composed of a plurality of heat pipes arranged in parallel, the heat pipes having an evaporation end And a condensing end; a hot surface aluminum plate, the condensation ends of the heat pipes are co-inserted in the hot aluminum plate and in close contact with the hot aluminum plate; a pair of cold aluminum plates are respectively covered on the top of the hot aluminum plate And a plurality of thermoelectric wafers, wherein the hot end of each thermoelectric wafer is attached to the hot aluminum plate, and the cold end of each thermoelectric wafer is attached to the cold aluminum plate for utilizing the hot aluminum plate and the The difference between the temperature of the aluminum plate surface generated current; wherein the first thermoelectric conversion portion of the evaporating end to penetrate the accommodating opening of the plate means, and in contact with the high temperature waste heat of the flue.

In one embodiment, the cold-faced aluminum plate is internally provided with a water-cooled pipe, which is cast into the cold-faced aluminum plate by pipe.

In the above embodiment, the water-cooled pipe has four in and four out Inlet and outlet, the diameter of the inlet and outlet is larger than the diameter of the water-cooled pipe.

In an embodiment, a blower is further disposed on the side of the boiler away from the exhaust duct for blowing high-temperature waste hot air generated by combustion of the boiler into the exhaust duct.

In one embodiment, the thermoelectric module further includes a power storage unit electrically connected to the thermoelectric chips and storing current generated by the thermoelectric chips.

In an embodiment, the thermoelectric module device port and the device plate are provided with corresponding screw-locking structures.

In an embodiment, the thermoelectric module further includes a second thermoelectric conversion portion, the second thermoelectric conversion portion having the same structure as the first thermoelectric conversion portion, wherein the heat pipes of the second thermoelectric conversion portion are alternately corresponding And disposed at a gap position of the heat pipes of the first thermoelectric conversion portion.

In an embodiment, the heat pipes of the thermoelectric conversion portion have an inclined angle with the horizontal mask, wherein the condensation end is higher than the evaporation end.

In one embodiment, the thermoelectric wafers are attached to the hot face aluminum plate at positions corresponding to the condensation ends of the respective heat pipes.

In an embodiment, the heat pipes employ finned heat pipes.

The thermoelectric module for generating electricity by waste heat recovery according to the present invention has the following effects: 1. The high temperature of the waste heat of the industrial boiler can be effectively utilized, combined with the characteristics of the thermoelectric material, and the temperature difference between the high temperature of the high temperature waste heat and the room temperature or the cooling temperature. The current is generated, that is, the waste heat is recovered to regenerate new energy and be used; 2. The structure of the device for extracting the image cassette is convenient in the use of the device and the replacement.

1‧‧‧Thermal module

1A‧‧‧Heat Power Module

11‧‧‧Device Department

111‧‧‧Device board

112‧‧‧Modular Framework

113‧‧‧容口

12‧‧‧First Thermal Power Conversion Department

12A‧‧‧Second Thermal Power Conversion Department

121‧‧‧heat pipe

121A‧‧‧heat pipe

1211‧‧‧Evaporation end

1212‧‧‧condensing end

122‧‧‧hot aluminum plate

122A‧‧‧ top surface

122B‧‧‧ bottom

13‧‧‧Thermal chip

14‧‧‧Cold aluminum plate

141‧‧‧Water-cooled pipeline

142A‧‧ ‧ water inlet

142B‧‧ ‧ water outlet

15‧‧‧Power Storage Department

16‧‧‧Baffle

2‧‧‧Boiler

3‧‧‧Exhaust flue

31‧‧‧Hot electric module device port

4‧‧‧Blowers

A‧‧‧High temperature waste heat

D‧‧‧ pipe diameter

D1‧‧‧ caliber

D2‧‧‧ pipe diameter

D‧‧‧depth

M‧‧‧liquid heat medium

M’‧‧‧Gaseous heat medium

S1‧‧‧first screw hole

S2‧‧‧Second screw hole

‧‧‧‧Tilt angle

1 is a schematic diagram of a position of a device for applying a thermoelectric module to a boiler device according to the present invention; FIG. 2A is a schematic diagram of a thermoelectric module device according to an embodiment of the present invention; and FIG. 2B is a thermoelectric conversion portion according to an embodiment of the present invention; 2C is a schematic view of the action of the heat pipe according to the present invention; FIG. 2D is a schematic view showing the position of the thermoelectric crystal face and the applied power generation of the present invention; FIG. 2E is an embodiment of the water-cooled pipe and the inlet and outlet of the present invention; 2F is a schematic structural view of another embodiment of the water-cooled pipe and the water inlet and outlet of the present invention; FIG. 3A is a front view of the thermoelectric module according to another embodiment of the present invention; A top view of a thermoelectric module of another embodiment.

The thermoelectric chip used in the invention is made of a thermoelectric material, and the thermoelectric material generates cold and hot ends after passing current, so it can be used for cooling or for heat preservation. If the temperature is simultaneously contacted at different ends, the thermoelectric material will form a current in the internal circuit, and the larger the temperature difference, the stronger the current generated, that is, the thermoelectric material can be used to receive the external heat source to generate electricity.

According to the data information of the Energy Information Network, the annual emission of waste heat of large industrial households is about 3.9 million metric tons of oil equivalent, more than 80 billion yuan worth of value, of which about 75% of waste heat below 250 °C, due to technology and domestic low-cost energy. It is a pity that it has not been recycled.

The main problem to be solved by the present invention is to utilize an industrial pot. The high-temperature characteristics of the waste hot gas discharged from the furnace, combined with the use of the thermoelectric wafer to generate electric current under the temperature difference, allow the high-temperature waste hot gas to be recovered and applied to generate energy, thereby achieving the effect of energy recovery and regeneration.

In order to solve the above problems, the present invention provides a thermoelectric module 1 for waste heat recovery power generation. As shown in FIG. 1, the thermoelectric module 1 of the present invention is applied to a boiler 2, and the boiler 2 is connected to a high-temperature waste hot gas A. The exhaust duct 3 has a pipe diameter D and a thermoelectric module device port 31 is disposed on the pipe wall, and the thermoelectric module 1 is installed at the port of the thermoelectric module device.

In the embodiment of FIG. 1 , a blower 4 is further disposed on the side of the boiler 2 away from the exhaust duct 3 for blowing the high-temperature waste hot gas A generated by the combustion of the boiler 2 into the exhaust duct 3 . emission.

Continuing to refer to FIG. 2A to FIG. 2F , the structure of the thermoelectric module 1 of the present invention includes: a device portion 11 having a device board 111 and a module frame 112 , the device board 111 defines a receiving port 113 , The depth d of the module frame 112 can be accommodated in the diameter D of the exhaust duct 3 (as shown in FIG. 1); and a first thermoelectric conversion portion 12 including a heat pipe composed of a plurality of heat pipes 121 arranged in parallel The heat pipe 121 has an evaporation end 1211 and a condensation end 1212. The condensation end 1212 of the heat pipe 121 is co-inserted into the interior of a hot aluminum plate 122 and is closely packed with the hot aluminum plate 122 as shown in FIG. 2C. In contact, the top surface 122A and the bottom surface 122B of the hot surface aluminum plate 122 are respectively covered with a cold surface aluminum plate 14. The first thermoelectric conversion portion 12 penetrates the receiving portion of the device plate 111 with the evaporation end 1211 as shown in FIG. 2A. In the port 113, as shown in FIG. 1, the evaporation end 1211 is in contact with the high-temperature waste hot gas A in the exhaust duct 3; wherein the hot-surface aluminum plate 122 and the cold-surface aluminum plate 14 correspond to the heat pipes The position of the condensing end 1212 of 121 is as shown in FIG. 2A, FIG. 2B and FIG. 2D, and is provided with The plurality of thermoelectric wafers 13 generate electric current by a temperature difference between a hot end bonded to the hot-surface aluminum plate 122 and a cold end bonded to the cold-surface aluminum plate 14.

In the embodiment of FIG. 2A, the thermoelectric module 1 further includes a power storage unit 15 electrically connected to the thermoelectric chips 13 and storing the current generated by the thermoelectric chips 13.

In the embodiment of FIG. 2A, the thermoelectric module device port 31 and the device board 111 are provided with corresponding screw-locking structures, such as a first screw hole portion S1 disposed on the device board 111 and a thermoelectric module. The second screw hole portion S2 around the device port 31.

In the embodiment of FIG. 2A, the thermoelectric module 1 further includes a second thermoelectric conversion portion 12A having the same structure as the first thermoelectric conversion portion 12, wherein the second thermoelectric conversion portion 12A The heat pipes 121A correspond to the positions of the heat pipes provided in the first thermoelectric conversion portion.

In the embodiment of FIG. 2A, the first thermoelectric conversion portion 12 further includes a partition plate 16 through which the heat pipes are disposed and which are parallel to and abut against the receiving opening of the device plate.

In the embodiment of FIG. 2B, the heat pipes 121 of the first thermoelectric conversion portion 12 have an inclination angle α with the horizontal mask, wherein the condensation end 1212 is higher than the evaporation end 1211.

In an embodiment of the invention, the cold-faced aluminum panels 14 remain outside the exhaust duct 3 and have a means of dissipating heat, such as air cooling. In another embodiment, the cold-faced aluminum panels 14 further comprise active heat-dissipating means, such as embedding a water-cooled conduit 141 therein, as shown in FIGS. 2B and 2D, and circulating water in the water-cooled conduit 141 by the pump. a liquid, wherein the water-cooled pipe 141 is cast in a pipe to the cold-faced aluminum plate 14 in.

In an embodiment, as shown in FIG. 2E or FIG. 2F, the water-cooling pipe 141 inside the cold-faced aluminum plate 14 has four inlets and four outlets (such as a water inlet 142A and a water outlet 142B), and the water inlets 142A and The diameter D1 of the water outlet 142B is larger than the diameter D2 of the water-cooled pipe 141.

In various embodiments, the water-cooled conduit 141 can provide different conduit designs as desired, as shown in Figures 2D-2F, and in one embodiment, the water inlet 142A and the outlet 142B have a diameter D1 that is the water-cooled conduit 141. The pipe diameter is twice that of D2.

2C, FIG. 2C is a schematic view of the heat pipe 121 of the thermoelectric module of the present invention. The evaporation end 1211 and the condensation end 1212 of the heat pipe 121 are closed, and the heat pipe 121 is evacuated. The heat pipe 121 is internally provided with a heat medium (such as pure water), and the heat medium performs a phase change cycle in the heat pipe 121. Since the heat pipe 121 and the horizontal plane have an inclination angle α as shown in FIG. 2B, and the condensation end 1212 is higher than the evaporation end 1211, the heat medium inside the heat pipe 121 is caused by the gravity. The condensation end 1212 flows toward the evaporation end 1211, and when the liquid heat medium M flows from the condensation end 1212 to the evaporation end 1211, since the evaporation end 1211 directly contacts the high-temperature waste hot gas A in the exhaust duct 3 as shown in FIG. The liquid heat medium M will change into a gaseous heat medium M', and depending on the fluid flowing from high pressure to low pressure physical properties, the gaseous heat medium M' will flow from the evaporation end 1211 to the condensation end 1212, and after the heat of the gaseous heat medium M' The condensation is again phased into a liquid heat medium M, which in turn forms a phase change cycle in the heat pipe 121 and achieves the effect of transferring the heat energy of the heat pipe evaporation end 1211 to the condensation end 1212 through this cycle.

3A and 3B, FIG. 3A and FIG. 3B are the present invention. A schematic front view and a top view of a thermoelectric module 1A of another embodiment.

In this embodiment, the thermoelectric module 1A further includes a second thermoelectric conversion portion 12A having the same structure as the first thermoelectric conversion portion 12, wherein the second thermoelectric conversion portion 12A The heat pipes 121A are staggered corresponding to the gap positions of the heat pipes 121 provided in the first thermoelectric conversion unit 12. The first thermoelectric conversion unit 12 and the second thermoelectric conversion unit 12A are both inserted into the accommodating port 113 of the device portion 11 with the evaporation end 1211 as shown in FIG. 2A, and the first screw hole on the device portion 11 thereof. The portion S1 is screwed to the second screw hole portion S2 on the exhaust duct 3.

The thermoelectric conversion portions are in direct contact with the high-temperature waste hot gas by the evaporation end 1211 penetrating into the exhaust duct 3, and the first thermoelectric conversion portion 12 and the heat pipes of the second thermoelectric conversion portion 12A are alternately arranged to be arranged. The area of the heat pipes 121 and 121A in contact with the high-temperature waste hot gas can be increased, thereby achieving better waste heat recovery power generation.

Corresponding to the unrecyclable 75% of the residual heat below 250 °C, it can effectively convert 75% of the residual heat into new energy (current) and then store or use it.

In summary, the disclosed utility model of the waste heat recovery power generation has the following effects: 1. The high temperature of the waste heat of the industrial boiler can be effectively utilized, combined with the characteristics of the thermoelectric material, through the high temperature and room temperature of the high temperature waste heat gas or The temperature difference of the cooling temperature generates electric current, that is, the waste heat is recovered to regenerate new energy and is used; 2. The structure of the device for extracting the image card is convenient in the use of the device and the replacement.

Embodiment or implementation of the technical means adopted by the present invention described above For example, it is not intended to limit the scope of the practice of the invention. That is, the equivalent changes and modifications made in accordance with the scope of the patent application of the present invention or the scope of the invention are covered by the scope of the invention.

Claims (10)

The utility model relates to a thermoelectric module for waste heat recovery power generation, which is suitable for a boiler. The boiler is connected with a exhaust pipe for discharging high-temperature waste hot gas. The side wall of the exhaust pipe is provided with a thermoelectric module connecting the inner space of the exhaust pipe and the external space thereof. The device is configured to: a device portion having a device plate and a module frame, the device plate having a receiving opening, the module frame having a depth The first thermoelectric conversion portion comprises: a heat pipe portion, which is composed of a plurality of heat pipes arranged in parallel, the heat pipes having an evaporation end and a condensation end; and a hot surface aluminum plate, The condensation ends of the heat pipes are co-inserted in the hot aluminum plate and in close contact with the hot aluminum plate; a pair of cold aluminum plates respectively covering the top and bottom surfaces of the hot aluminum plate; and a plurality of thermoelectric wafers, The hot end of each thermoelectric wafer is bonded to the hot aluminum plate, and the cold end of each thermoelectric chip is attached to the cold aluminum plate for generating a current by using a temperature difference between the hot aluminum plate and the cold aluminum plate; The first thermoelectric conversion portion of the evaporating end to penetrate the accommodating opening of the plate means, and in contact with the high temperature waste heat within the flue. The thermoelectric module for waste heat recovery power generation according to the first aspect of the invention, wherein the cold-faced aluminum plate is internally provided with a water-cooled pipe, and the water-cooled pipe is cast into the cold-faced aluminum plate by pipe. The thermoelectric module for waste heat recovery power generation according to claim 2, wherein the water-cooled pipeline has four inlets and four outlets, and the diameter of the inlet and outlet is larger than the diameter of the water-cooled pipeline. The thermoelectric module for waste heat recovery power generation according to claim 1, further comprising a blower disposed on a side of the boiler away from the exhaust duct for blowing high-temperature waste hot gas generated by combustion of the boiler into the boiler Discharged in the flue. The pyroelectric module for waste heat recovery power generation according to claim 1, wherein the thermoelectric module further includes a power storage unit electrically connected to the thermoelectric chips and storing current generated by the thermoelectric chips. The thermoelectric module for waste heat recovery power generation according to claim 1, wherein the thermoelectric module device port and the device plate are provided with a corresponding screw-locking structure. The thermoelectric module of the waste heat recovery power generation according to the first aspect of the invention, wherein the thermoelectric module further comprises a second thermoelectric conversion portion, the second thermoelectric conversion portion having the same structure as the first thermoelectric conversion portion, wherein The heat pipes of the second thermoelectric conversion portion are staggered corresponding to the gap positions of the heat pipes provided in the first thermoelectric conversion portion. The thermoelectric module for waste heat recovery power generation according to claim 1, wherein the heat pipes of the thermoelectric conversion portion have an inclined angle with the horizontal mask, wherein the condensation end is higher than the evaporation end. The thermoelectric module for waste heat recovery power generation according to claim 1, wherein the thermoelectric wafers are attached to positions on the hot aluminum plate corresponding to the condensation ends of the respective heat pipes. A thermoelectric module for waste heat recovery power generation as described in claim 1 of the patent scope, Among them, the heat pipes use finned heat pipes.