Flue gas waste heat power generation device

Abstract

The invention relates to the technical field of waste heat recovery, in particular to a flue gas waste heat power generation device which comprises a boiler, a pipeline and a temperature difference power generation module. The pipeline comprises a heat absorption pipeline, a heat dissipation pipeline and a cold water tank; the thermoelectric power generation module comprises a heat absorption piece, a heat dissipation piece and a thermoelectric refrigeration piece. The turbine blades are additionally arranged on the portion, located in the flue, of the water pipe, the turbine blades rotate along with water flow, turbulent flow is formed, and the heat transfer efficiency is improved. In addition, rotation of the turbine blades further drives the rapping assembly to rap the pipeline in the flue, accumulated dust on the outer wall of the pipeline is removed, and the good heat conduction performance of the pipeline is kept. The part, passing through the flue, of the water pipe absorbs heat and then flows through the hot end of the thermoelectric power generation piece outside the flue, power is generated through the thermoelectric refrigeration piece, then cooled water flow passes through the cold end of the thermoelectric power generation piece and absorbs heat of the cold end, and effective heat dissipation of the cold end of the thermoelectric power generation piece is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of waste heat recovery, in particular to a flue gas waste heat power generation device. Background Art

[0002] In thermal power plants, flue gas contains a large amount of waste heat. If it can be effectively recycled and utilized, it can not only improve energy utilization efficiency, but also reduce environmental pollution. However, most of the existing waste heat recovery technologies have problems such as low efficiency, complex equipment, and difficult maintenance. Some common methods such as heat exchangers and waste heat boilers can recover part of the waste heat, but due to dust accumulation, corrosion and other problems, the thermal efficiency will drop significantly after long-term operation. In addition, the application of thermoelectric cooling sheets in the prior art is mainly concentrated in the fields of temperature difference power generation and refrigeration, and conventional methods are often difficult to maintain operation in complex industrial environments. Especially in the high temperature and high dust environment of the flue, how to effectively improve the working efficiency of the thermoelectric cooling sheet, especially to increase the temperature difference between its hot end and the cold end, is a problem that needs to be solved urgently. Therefore, the development of a reliable flue waste heat recovery device is of great significance to improving the overall energy utilization efficiency of thermal power plants and reducing environmental pollution. Summary of the invention

[0003] In view of the above problems existing in the prior art, the present invention is proposed.

[0004] Therefore, the problem to be solved by the present invention is to recover the waste heat in the flue gas and convert the heat into electrical energy through a thermoelectric cooling sheet, and the generated electrical energy is used for lighting equipment.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: a flue gas waste heat power generation device, comprising a boiler, a pipeline, including a heat absorption pipeline, a heat dissipation pipeline, and a cold water tank, wherein the heat absorption pipeline is arranged in the boiler, the heat dissipation pipeline is arranged outside the boiler, and the two ends of the cold water tank are respectively connected to the initial section of the heat absorption pipeline and the end of the heat dissipation pipeline.

[0006] As a preferred solution of the flue gas waste heat power generation device described in the present invention, the heat absorption pipeline is provided with a heat absorption spiral section and a rapping member, the heat absorption spiral section is arranged in the boiler, and the rapping member is arranged in the heat absorption spiral section.

[0007] As a preferred solution of the flue gas waste heat power generation device described in the present invention, the heat dissipation pipe is provided with a heat dissipation spiral section and a first turbine blade, the heat dissipation spiral section is arranged outside the boiler, and the first turbine blade is arranged inside the heat dissipation spiral section.

[0008] As a preferred solution of the flue gas waste heat power generation device described in the present invention, the heat absorbing component includes a heat-conducting base and a first thermally conductive silicone grease, and the heat-conducting base is arranged at the end of the heat dissipation pipe; a first groove is arranged on the heat-conducting base, and the first thermally conductive silicone grease is arranged at the end of the first groove.

[0009] As a preferred solution of the flue gas waste heat power generation device described in the present invention, wherein: the thermoelectric cooling plate is distributed below the first thermal conductive silicone grease; a positive terminal post and a negative terminal post are also provided in the first groove, and the positive terminal post and the negative terminal post connect the leads of several thermoelectric cooling plates in parallel and lead them out to the outside of the thermal conductive base.

[0010] As a preferred solution of the flue gas waste heat power generation device described in the present invention, the heat sink includes a heat sink base and a second thermal conductive silicone grease, the heat sink base is arranged above the cold water tank and is snap-fitted with the thermal conductive base, and the second thermal conductive silicone grease is arranged between the heat sink base and the thermoelectric cooling sheet.

[0011] As a preferred solution of the flue gas waste heat power generation device described in the present invention, the rapping member includes a second turbine blade, a base, and a rapping hammer, the base is connected to the inner wall of the heat absorption spiral section, the second turbine blade is rotatably matched with the base, and the rapping hammer is arranged in the base.

[0012] As a preferred solution of the flue gas waste heat power generation device described in the present invention, wherein: a notch is provided at one end of the second turbine blade connected to the base, and the notch is distributed circumferentially along the end face of the second turbine blade; the notch is provided with an oblique section, an arc section, and a diameter section, the oblique section does not pass through the center of the end face, the arc section is concentrically arranged with the end face, and the diameter section is radially arranged along the end face, and in the same notch, the two ends of the arc section are respectively connected to the oblique section and one end of the diameter section, and the oblique section is connected to the diameter section in the adjacent notch.

[0013] As a preferred solution of the flue gas waste heat power generation device described in the present invention, the base is provided with a column groove, a connecting rod, a rod groove, a straight groove, and a spring groove. The column groove is provided on the end face of the base and is rotatably matched with the second turbine blade. The connecting rod is provided on the side wall of the base and is connected to the inner wall of the heat absorption spiral section. The rod groove is provided in the connecting rod. The straight groove is provided on the end face of the column groove and is connected to the rod groove. The spring groove is provided on the side wall of the rod groove.

[0014] As a preferred solution of the flue gas waste heat power generation device described in the present invention, wherein: the rapping hammer is slidably matched with the rod groove, the rapping hammer is provided with a baffle, a spring, and a protrusion, the baffle is slidably matched with the spring groove, the spring is arranged between the baffle and the end face of the spring groove, the protrusion is arranged on the side wall of the rapping hammer, and is slidably matched with the straight groove and the notch.

[0015] The beneficial effects of the present invention are as follows: the present invention significantly improves the heat exchange efficiency between the water flow and the flue waste heat by adding turbine blades to the part of the water pipe located in the flue. The turbine blades rotate with the water flow to form turbulence, increase the contact area and time between the water flow and the pipe wall, and thus improve the heat transfer efficiency. In addition, the rotation of the turbine blades also drives the rapping assembly to rap the pipe in the flue, remove the dust accumulation on the outer wall of the pipe, and maintain the good thermal conductivity of the pipe, thereby further improving the heat exchange effect. After the water pipe absorbs heat through the part in the flue, it flows through the hot end of the thermoelectric generator outside the flue, and generates electricity using the thermoelectric generator. Then the water flow enters the cooling section provided with spiral blades, and is cooled by the disturbance of the spiral blades. The cooled water flow then passes through the cold end of the thermoelectric generator, absorbs the heat of the cold end, and realizes effective heat dissipation of the cold end of the thermoelectric generator. The present invention not only improves the heat exchange efficiency of the water flow and the power generation efficiency of the thermoelectric generator, but also maintains the long-term stable operation of the pipeline by removing the dust accumulation on the outer wall of the pipe in the flue, and has significant economic and environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0017] Figure 1 This is the overall diagram of the flue gas waste heat power generation device.

[0018] Figure 2 This is a structural diagram of the first turbine blade of the flue gas waste heat power generation device.

[0019] Figure 3 This is the structural diagram of the rapping components of the flue gas waste heat power generation device.

[0020] Figure 4 This is the structural diagram of the temperature difference power generation module of the flue gas waste heat power generation device.

[0021] Figure 5 This is the distribution diagram of the thermoelectric cooling plate of the flue gas waste heat power generation device.

[0022] Figure 6This is an exploded view of the rapping components of the flue gas waste heat power generation device.

[0023] Figure 7 This is a bottom view of the second turbine blade of the flue gas waste heat power generation device.

[0024] Figure 8 This is a cross-sectional view of the base of the flue gas waste heat power generation device. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it an embodiment that is mutually exclusive with other embodiments, either individually or selectively.

[0028] Example 1

[0029] Reference Figure 1 , which is the first embodiment of the present invention, provides a flue gas waste heat power generation device, which includes a boiler 100, a pipeline 200 and a temperature difference power generation module 300.

[0030] Specifically, the pipeline 200 includes a heat absorbing pipeline 201, a heat dissipating pipeline 202, and a cold water tank 210. The heat absorbing pipeline 201 is arranged inside the boiler 100, and the heat dissipating pipeline 202 is arranged outside the boiler 100. Both ends of the cold water tank 210 are respectively connected to the initial section of the heat absorbing pipeline 201 and the end of the heat dissipating pipeline 202;

[0031] The direction of water flow in the pipeline is from the cold water tank 210 to the heat absorption pipeline 201. After absorbing heat, it passes through the temperature difference power generation module 300, flows into the heat dissipation pipeline 202 for heat dissipation, and then flows back to the cold water tank. It is worth mentioning that a water pump is provided at the interface between the cold water tank 210 and the heat absorption pipeline 201 so that the water can flow continuously.

[0032] Specifically, the temperature difference power generation module 300 includes a heat absorbing member 301, a heat dissipating member 302, and a thermoelectric cooling sheet 303. The heat absorbing member 301 is arranged between the initial section of the heat dissipating pipe 202 and the thermoelectric cooling sheet 303, and the heat dissipating member 302 is arranged between the end of the heat dissipating pipe and the thermoelectric cooling sheet 303.

[0033] The heat absorbing element 301 transfers the heat of the heat absorbing pipe 201 to one side of the thermoelectric cooling sheet 303, and the heat dissipating element 302 conducts the heat of the thermoelectric cooling sheet 303 away from the side of the heat absorbing element 301, so that a large temperature difference is generated at both ends of the thermoelectric cooling sheet 303, forming a good temperature gradient, which is conducive to the thermoelectric cooling sheet 303 to generate electricity.

[0034] The generated electricity can be used for lighting, water pumps, valves and other electrical equipment, or directly connected to the power grid. In order to ensure the normal operation of equipment when the power plant is shut down, a certain amount of batteries can be installed to store part of the electricity, so as to achieve continuous power supply to electrical equipment during the shutdown process.

[0035] Example 2

[0036] Reference Figure 2 to Figure 8 , which is the second embodiment of the present invention, and this embodiment is based on the previous embodiment.

[0037] Specifically, the heat absorbing pipe 201 is provided with a heat absorbing spiral section 203 and a rapping member 204, the heat absorbing spiral section 203 is provided in the boiler 100, and the rapping member 204 is provided in the heat absorbing spiral section 203;

[0038] The heat-absorbing spiral section 203 increases the length of the pipe within the limited space of the flue 100, thereby increasing the water flow path and slowing down the speed, so that the water flow inside can fully absorb the residual heat of the flue gas. The rapping member 204 uses the water flow in the pipe 200 as a drive to vibrate the inner wall of the water pipe in the flue, thereby removing the dust accumulated on the outer wall of the heat-absorbing pipe 201 in the flue and improving the heat transfer efficiency.

[0039] Specifically, the heat dissipation pipe 202 is provided with a heat dissipation spiral section 205 and a first turbine blade 206. The heat dissipation spiral section 205 is provided outside the boiler 100, and the first turbine blade 206 is provided inside the heat dissipation spiral section 205.

[0040] The heat dissipation spiral section 205 can also increase the water flow path and slow down the speed so that the water flow can fully dissipate heat in the heat dissipation pipe. When the water flows through the first turbine blade 206, it will drive the first turbine blade 206 to rotate. The hot water forms turbulence in the first turbine blade 206 section and fully contacts the pipe wall. The heat is conducted to the outside through the heat dissipation spiral section 205. The first turbine blade 206 enhances the convective heat transfer effect of the water flow and rapidly reduces the water temperature.

[0041] Specifically, the heat absorbing member 301 includes a heat conductive base 301a and a first heat conductive silicone grease 301b. The heat conductive base 301a is disposed at the end of the heat absorbing pipe 201. A first groove 301c is disposed on the heat conductive base 301a. The first heat conductive silicone grease 301b is disposed at the end of the first groove 301c.

[0042] The heat-conducting base 301 a conducts the heat of the heat-absorbing pipe 201 to the hot end of the thermoelectric cooling sheet 303 .

[0043] Specifically, the thermoelectric cooling sheet 303 is distributed below the first thermal grease 301b; a positive terminal 301d and a negative terminal 301e are also provided in the first groove 301c, and the positive terminal 301d and the negative terminal 301e connect the leads of several thermoelectric cooling sheets 303 in parallel and lead them out to the outside of the thermal base 301a.

[0044] Specifically, the heat sink 302 includes a heat sink base 302a and a second thermally conductive silicone grease 302b. The heat sink base 302a is disposed above the cold water tank 210 and is engaged with the thermally conductive base 301a. The second thermally conductive silicone grease 302b is disposed between the heat sink base 302a and the thermoelectric cooling sheet 303.

[0045] The heat sink 302 transfers the heat of the cold end of the thermoelectric cooling sheet 303 to the cold water tank 210, and dissipates the heat of the cold end through the cold water that has already dissipated the heat, thereby effectively increasing the temperature difference between the two ends of the thermoelectric cooling sheet 303. In this solution, the water flow can not only absorb the waste heat of the flue gas to enable the thermoelectric cooling sheet 303 to generate electricity, but also provide water cooling for the cold end of the thermoelectric cooling sheet 303, thereby improving the power generation efficiency.

[0046] It is worth noting that the thermal conductive base 301a and the heat dissipation base 302a are both made of aluminum, and the first thermal conductive silicone grease 302b and the second thermal conductive silicone grease 302b are both filled with heat insulating cotton between the heat dissipation base 302a and the thermal conductive base 301a for better thermal conductivity to prevent heat loss from the heat absorption pipe 201, and the positive terminal 301d and the negative terminal 301e are directly electrically connected to the electrical appliances to increase the electrical energy for the electrical appliances.

[0047] Specifically, the rapping member 204 includes a second turbine blade 204a, a base 208, and a rapping hammer 209. The base 208 is connected to the inner wall of the heat absorbing spiral section 203. The second turbine blade 204a is rotatably matched with the base 208. The rapping hammer 209 is disposed in the base 208.

[0048] When water flows through the second turbine blade 204a, turbulence is formed in the spiral blade segment, which is in full contact with the pipe wall. The waste heat of the flue gas is transferred to the internal water flow through the heat absorption pipe 201. The spiral blade rotates under the push of the water flow, thereby enhancing the convective heat transfer effect of the water flow, causing the water temperature to rise rapidly and improving the heat exchange efficiency. The second turbine blade 204a can also be used to drive the rapping hammer 209 to rap the heat absorption pipe 201 to avoid the dust in the flue 100 being adsorbed on the outside of the heat absorption pipe 201 in the flue 100 and affecting the heat transfer efficiency. The base 208 is used to fix the second turbine blade 204a and the rapping hammer 209.

[0049] Specifically, a notch 207 is provided at one end of the second turbine blade 204a connected to the base 208, and the notches 207 are distributed circumferentially along the end surface of the second turbine blade 204a; the notch 207 is provided with an oblique section 207a, an arc section 207b, and a radial section 207c, the oblique section 207a does not pass through the center of the end surface, the arc section 207b is concentrically arranged with the end surface, and the radial section 207c is arranged radially along the end surface, in the same notch 207, the two ends of the arc section 207b are respectively connected to one end of the oblique section 207a and the radial section 207c, and the oblique section 207a is connected to the radial section 207c in the adjacent notch 207;

[0050] It is worth noting that the two ends of the inclined section 207a are at different distances from the axis of the second turbine blade 204a, and the two ends of the arc section 207b in the same slot 207 are connected to the end of the inclined section 207a and the radial section 207c away from the axis. The number of slots 207 matches the number of rapping hammers 209, which is 3 in the present embodiment.

[0051] Specifically, the base 208 is provided with a column groove 208a, a connecting rod 208b, a rod groove 208c, a straight groove 208d, and a spring groove 208e. The column groove 208a is provided on the end face of the base 208 and is rotatably matched with the second turbine blade 204a. The connecting rod 208b is provided on the side wall of the base 208 and is connected to the inner wall of the heat absorption spiral section 203. The rod groove 208c is provided in the connecting rod 208b. The straight groove 208d is provided on the end face of the column groove 208a and is connected to the rod groove 208c. The spring groove 208e is provided on the side wall of the rod groove 208c.

[0052] Specifically, the rapping hammer 209 is slidably matched with the rod groove 208c, and the rapping hammer 209 is provided with a baffle 209a, a spring 209b, and a protrusion 209c. The baffle 209a is slidably matched with the spring groove 208e, and the spring 209b is arranged between the baffle 209a and the end surface of the spring groove 208e. The protrusion 209c is arranged on the side wall of the rapping hammer 209, and is slidably matched with the straight groove 208d and the notch 207;

[0053] In the initial state, the spring 209b is at its original length, and the protrusion 209c is located at the end of the straight groove 208d and the radial section 207c away from the axis. At this time, one end of the rapping hammer 209 is in contact with the inner wall of the heat absorption pipe 201. When the second turbine blade 204a rotates, the protrusion 209c first moves along the arc section 207b. During this process, the rapping hammer 209 does not move. Then the protrusion 209c moves into the inclined section 207a. During this process, the inclined section 207a drives the protrusion 209c to move along the straight groove 208d toward the axis. The spring 209b Under the squeeze, as the second turbine blade 204a continues to rotate, the protrusion 209c moves to the radial section 207c in the adjacent groove 207, and the protrusion 209c loses the restriction of the inclined section 207a, and resets under the action of the spring 209b. The protrusion 209c moves to the arc section 207b, and one end of the rapping hammer 209 quickly hits the inner wall of the pipe, completing the rapping of the inner wall of the pipe by the rapping hammer 209. Therefore, under the continuous rotation of the second turbine blade 204a, the rapping hammer 209 also continues to rap the inner wall of the pipe, completing the cleaning of the outer wall of the heat absorption pipe 201.

[0054] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A flue gas waste heat power generation device, characterized in that: include, Boiler (100); The pipeline (200) comprises a heat absorbing pipeline (201), a heat dissipating pipeline (202), and a cold water tank (210), wherein the heat absorbing pipeline (201) is arranged inside the boiler (100), the heat dissipating pipeline (202) is arranged outside the boiler (100), and two ends of the cold water tank (210) are respectively connected to the initial section of the heat absorbing pipeline (201) and the end of the heat dissipating pipeline (202); The temperature difference power generation module (300) comprises a heat absorbing element (301), a heat dissipating element (302), and a thermoelectric cooling sheet (303); the heat absorbing element (301) is arranged between the initial section of the heat dissipating pipe (202) and the thermoelectric cooling sheet (303); and the heat dissipating element (302) is arranged between the end of the heat dissipating pipe and the thermoelectric cooling sheet (303).

2. The flue gas waste heat power generation device according to claim 1, characterized in that: The heat absorbing pipe (201) is provided with a heat absorbing spiral section (203) and a rapping member (204); the heat absorbing spiral section (203) is arranged in the boiler (100); and the rapping member (204) is arranged in the heat absorbing spiral section (203).

3. The flue gas waste heat power generation device according to claim 2, characterized in that: The heat dissipation pipe (202) is provided with a heat dissipation spiral section (205) and a first turbine blade (206); the heat dissipation spiral section (205) is arranged outside the boiler (100), and the first turbine blade (206) is arranged inside the heat dissipation spiral section (205).

4. The flue gas waste heat power generation device according to claim 3, characterized in that: The heat absorbing component (301) comprises a heat-conducting base (301a) and a first heat-conducting silicone grease (301b); the heat-conducting base (301a) is arranged at the end of the heat-absorbing pipe (201); The heat-conducting base (301a) is provided with a first groove (301c), and the first heat-conducting silicone grease (301b) is arranged at the end of the first groove (301c).

5. The flue gas waste heat power generation device according to claim 4, characterized in that: The thermoelectric cooling sheet (303) is distributed and arranged below the first thermal conductive silicone grease (301b); A positive terminal (301d) and a negative terminal (301e) are also provided in the first groove (301c); the positive terminal (301d) and the negative terminal (301e) connect the leads of a plurality of the thermoelectric cooling sheets (303) in parallel and lead them out to the outside of the heat-conducting base (301a).

6. The flue gas waste heat power generation device according to claim 5, characterized in that: The heat sink (302) comprises a heat sink base (302a) and a second thermally conductive silicone grease (302b); the heat sink base (302a) is arranged above the cold water tank (210) and is snap-fitted with the thermally conductive base (301a); and the second thermally conductive silicone grease (302b) is arranged between the heat sink base (302a) and the thermoelectric cooling sheet (303).

7. The flue gas waste heat power generation device according to claim 6, characterized in that: The rapping member (204) comprises a second turbine blade (204a), a base (208), and a rapping hammer (209); the base (208) is connected to the inner wall of the heat absorbing spiral section (203); the second turbine blade (204a) is rotatably matched with the base (208); and the rapping hammer (209) is arranged in the base (208).

8. The flue gas waste heat power generation device according to claim 7, characterized in that: One end of the second turbine blade (204a) connected to the base (208) is provided with a notch (207), and the notch (207) is distributed circumferentially along the end surface of the second turbine blade (204a); The slot (207) is provided with an oblique section (207a), an arc section (207b), and a diameter section (207c); the oblique section (207a) does not pass through the center of the end face; the arc section (207b) is arranged concentrically with the end face; the diameter section (207c) is arranged radially along the end face; in the same slot (207), two ends of the arc section (207b) are respectively connected to one end of the oblique section (207a) and the diameter section (207c); the oblique section (207a) is connected to the diameter section (207c) in the adjacent slot (207).

9. The flue gas waste heat power generation device according to claim 8, characterized in that: The base (208) is provided with a column groove (208a), a connecting rod (208b), a rod groove (208c), a straight groove (208d), and a spring groove (208e); the column groove (208a) is provided on the end surface of the base (208) and is rotatably matched with the second turbine blade (204a); the connecting rod (208b) is provided on the side wall of the base (208) and is connected to the inner wall of the heat absorption spiral section (203); the rod groove (208c) is provided in the connecting rod (208b); the straight groove (208d) is provided on the end surface of the column groove (208a) and is connected to the rod groove (208c); and the spring groove (208e) is provided on the side wall of the rod groove (208c).

10. The flue gas waste heat power generation device according to claim 9, characterized in that: The rapping hammer (209) is slidably matched with the rod groove (208c), and the rapping hammer (209) is provided with a baffle (209a), a spring (209b), and a protrusion (209c). The baffle (209a) is slidably matched with the spring groove (208e), and the spring (209b) is arranged between the baffle (209a) and the end surface of the spring groove (208e). The protrusion (209c) is arranged on the side wall of the rapping hammer (209) and is slidably matched with the straight groove (208d) and the notch (207).

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