CN113108361A - Waste heat utilization system and method for heat supply boiler - Google Patents
Waste heat utilization system and method for heat supply boiler Download PDFInfo
- Publication number
- CN113108361A CN113108361A CN202110559286.7A CN202110559286A CN113108361A CN 113108361 A CN113108361 A CN 113108361A CN 202110559286 A CN202110559286 A CN 202110559286A CN 113108361 A CN113108361 A CN 113108361A
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- Prior art keywords
- heat
- waste heat
- power generation
- generation device
- cooling
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- 239000002918 waste heat Substances 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000010248 power generation Methods 0.000 claims abstract description 36
- 238000001816 cooling Methods 0.000 claims abstract description 34
- 239000000498 cooling water Substances 0.000 claims abstract description 14
- 229910052782 aluminium Inorganic materials 0.000 claims description 27
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 27
- 239000004065 semiconductor Substances 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000000779 smoke Substances 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 239000000110 cooling liquid Substances 0.000 claims description 4
- 229910052797 bismuth Inorganic materials 0.000 claims description 3
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims description 3
- 238000005485 electric heating Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- MFIWAIVSOUGHLI-UHFFFAOYSA-N selenium;tin Chemical compound [Sn]=[Se] MFIWAIVSOUGHLI-UHFFFAOYSA-N 0.000 claims description 3
- XSOKHXFFCGXDJZ-UHFFFAOYSA-N telluride(2-) Chemical compound [Te-2] XSOKHXFFCGXDJZ-UHFFFAOYSA-N 0.000 claims description 3
- 230000002528 anti-freeze Effects 0.000 claims 1
- 239000002826 coolant Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 5
- 239000003344 environmental pollutant Substances 0.000 abstract description 2
- 231100000719 pollutant Toxicity 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D15/00—Other domestic- or space-heating systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0014—Recuperative heat exchangers the heat being recuperated from waste air or from vapors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
- F28F21/081—Heat exchange elements made from metals or metal alloys
- F28F21/084—Heat exchange elements made from metals or metal alloys from aluminium or aluminium alloys
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N11/00—Generators or motors not provided for elsewhere; Alleged perpetua mobilia obtained by electric or magnetic means
- H02N11/002—Generators
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention discloses a waste heat utilization system and a method of a heat supply boiler, wherein the cold end and the hot end of a temperature difference power generation device are kept in stable high temperature difference through tail exhaust waste heat of the boiler and stable low temperature of winter environment, so that electric energy is generated, and stable, efficient and clean auxiliary power is provided by performing fixed frequency and fixed pressure on the electric energy through a direct current junction station and an inverter; the tail exhaust waste heat of the boiler belongs to waste heat of the boiler, the cold source of the cold end depends on the cooling water tank and the cooling fan of the built-in cooling working medium of the cooler to finish the cooling effect, the energy utilization efficiency is further improved, and the cooling device is simple, high-efficiency, safe, environment-friendly and free of pollutant emission.
Description
Technical Field
The invention relates to the technical field of waste heat recovery, in particular to a waste heat utilization device and method of a heat supply boiler.
Background
Nowadays, energy conservation and emission reduction are increasingly important, and energy shortage is an important problem in sustainable development of society and economy in China.
The clean and efficient utilization of energy is the inevitable direction of industry development, and no matter a power plant or a heating power station, the discharged smoke of a boiler unit contains a large amount of low-grade waste heat, so that the low-temperature waste heat utilization of the discharged smoke of the boiler can effectively improve the energy utilization rate, and the energy-saving and emission-reducing effects are achieved.
The exhaust gas temperature of a common heat supply boiler unit is between 90 ℃ and 180 ℃, the waste heat at the exhaust gas temperature is difficult to utilize, the energy-saving potential is small, the efficiency is low, and in the prior art, a large amount of electric energy is still input into the system by adopting industrial power or other power supplies, so that the energy-saving effect is not obvious.
Disclosure of Invention
The invention provides a waste heat utilization system and method of a heat supply boiler, aiming at the problem that the waste heat recovery efficiency of a station supply station between heating stations is low in the prior art.
The invention is realized by the following technical scheme:
a waste heat utilization system of a heat supply boiler comprises a plurality of aluminum heat accumulators and a temperature difference power generation device; one side of the aluminum heat accumulator is a smooth plane and is arranged on the inner wall of a flue at the tail part of the boiler, and the other side of the aluminum heat accumulator is provided with a plurality of H-shaped heat absorption fins; a plurality of hot ends of the temperature difference power generation device are respectively connected with the aluminum heat accumulator, the cold ends of the temperature difference power generation device are connected with the cooler, and the output end of the temperature difference power generation device is sequentially connected with the direct current junction station and the inverter.
Further, the thermoelectric power generation device comprises a plurality of semiconductor thermoelectric power generators which are connected in parallel.
Furthermore, the output ends of the semiconductor thermoelectric generators are converged to the same line and connected with the input end of the direct current combiner.
Furthermore, the semiconductor thermoelectric generator adopts a high-energy-efficiency semiconductor thermoelectric generator comprising bismuth telluride or tin selenide, and the semiconductor thermoelectric generator internally comprises a plurality of thermoelectric generation modules.
Furthermore, three semiconductor thermoelectric generators are correspondingly matched and arranged on one aluminum heat accumulator.
Further, the cooler comprises a cooling water tank with a built-in cooling working medium, and the cold end of the temperature difference power generation device is arranged in the cooling water tank; the cooling working medium adopts a liquid cooler of water or low-temperature antifreezing cooling liquid.
Furthermore, a circulation pipeline for cooling working media is arranged on the cooling water tank, a working medium circulation pump is arranged on the circulation pipeline, and a cooling fan is arranged outside the water tank.
Furthermore, the cooling water tank is externally provided with radiating fins, and the radiating fins are provided with electric heating wires.
A method for generating power by temperature difference of a heat supply station comprises the following steps: the waste heat of the exhaust smoke in the flue at the tail of the boiler heats the aluminum heat reservoir, and the aluminum heat reservoir absorbs heat and conducts heat to the hot end of the thermoelectric power generation device at the same time to provide a stable heat source; the cold end of the temperature difference power generation device is cooled through a cooler, so that the two ends of the temperature difference power generation device keep constant high temperature difference and generate power continuously; the thermoelectric generation device generates current and converges the current to the direct current convergence box, and then the current is continuously output to stabilize electric energy through the inverter.
Furthermore, the cold ends of a plurality of semiconductor thermoelectric generators connected in parallel in the thermoelectric power generation device are respectively and forcibly cooled by water or low-temperature anti-freezing cooling liquid in a cooler under the action of a working medium circulating pump and a cooling fan.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the waste heat utilization system of the heat supply boiler, the cold end and the hot end of the temperature difference power generation device are kept in a stable high temperature difference through the tail exhaust waste heat of the boiler and the stable low temperature of the winter environment, so that electric energy is generated, and the electric energy is subjected to constant frequency and constant pressure through the direct current junction station and the inverter, so that stable, efficient and clean auxiliary electricity is provided; the tail exhaust waste heat of the boiler belongs to waste heat of the boiler, the cold source of the cold end depends on the cooling water tank and the cooling fan of the built-in cooling working medium of the cooler to finish the cooling effect, the energy utilization efficiency is further improved, and the cooling device is simple, high-efficiency, safe, environment-friendly and free of pollutant emission.
The invention relates to a waste heat utilization method of a heat supply boiler, which is characterized in that an aluminum heat reservoir is heated by smoke waste heat at the tail part of the boiler, the aluminum heat reservoir transfers heat energy to the hot end of a temperature difference power generation device, and meanwhile, a cooling working medium is utilized to cool the cold end of the temperature difference power generation device, so that the hot end and the cold end of the temperature difference power generation device keep constant high temperature difference and generate power continuously; the method can efficiently utilize the flue gas at the tail part of the boiler to carry out electric energy conversion, is convenient to operate, and greatly improves the utilization rate of the waste heat of the boiler.
Drawings
Fig. 1 shows a system for utilizing waste heat of a heating boiler according to an embodiment of the present invention.
In the figure: the system comprises a boiler tail flue 1, an aluminum heat accumulator 2, a temperature difference power generation device 3, a semiconductor temperature difference power generator 31, a water cooler 4, a direct current junction station 5 and an inverter 6.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
A waste heat utilization system of a heat supply boiler is shown in figure 1 and comprises a boiler tail flue 1, an aluminum heat accumulator 2 and a temperature difference power generation device 3; one side of the aluminum heat accumulator 2 is a smooth plane and is arranged on the inner wall of the boiler tail flue 1, and the other side of the aluminum heat accumulator is provided with a plurality of H-shaped heat absorption fins; a plurality of hot junctions of thermoelectric generation device 3 are connected aluminium system heat accumulator 2 respectively and are carried out heat transfer, and the cooler 4 is connected to the cold junction, and the output connects gradually direct current combiner 5 and dc-to-ac converter 6.
The thermoelectric power generation device 3 comprises a plurality of semiconductor thermoelectric generators 31 which are connected in parallel, wherein the output ends of the plurality of semiconductor thermoelectric generators 31 are converged to the same line and connected with the input end of the direct current combiner 5; the semiconductor thermoelectric generator 31 adopts an energy-efficient semiconductor thermoelectric generator comprising bismuth telluride or tin selenide, so that the conversion efficiency is higher; and the semiconductor thermoelectric generator 31 comprises a plurality of thermoelectric generation modules inside, so that the conversion efficiency is further improved.
In an embodiment of the present invention, the method includes, but is not limited to, correspondingly arranging three semiconductor thermoelectric generators 31 in an aluminum heat accumulator 2, and correspondingly arranging several semiconductor thermoelectric generators 31 in the aluminum heat accumulator 2 according to actual conditions, that is, the heat absorption condition of the aluminum heat accumulator 2 on the inner wall of the boiler tail flue 1 and the heat transfer efficiency of the H-shaped heat absorption fin, and the heat end of the aluminum heat accumulator 2 and the thermoelectric generation device 3.
The cooler 4 comprises a cooling water tank with a built-in cooling working medium, and the cold end of the temperature difference power generation device 3 is arranged in the cooling water tank; the cooling working medium adopts a liquid cooler of water or low-temperature anti-freezing cooling liquid, wherein a cooling water tank is provided with a circulating pipeline of the cooling working medium, a working medium circulating pump is arranged on the circulating pipeline, and a cooling fan is arranged outside the water tank. The cooling working medium is forcibly cooled by the fan, and the fan takes away the heat of the area near the cooling working medium, so that the cooling time of the cooling working medium is shortened; the cooler 4 includes but is not limited to a water-cooling cooler, and the radiating fins of the cooler 4 are provided with electric heating wires to avoid the radiating fins from frosting after long-term operation.
The output end of the inverter 6 is also connected with a power supply battery pack which continuously supplies power to the auxiliary equipment and the instrument, and finally the waste heat of the boiler tail flue 1 is converted into power, so that the waste heat is utilized, the energy-saving potential of the heat supply boiler is improved, and the utilization rate of energy is improved.
The invention discloses a temperature difference power generation method for a heat supply station, which comprises the following steps:
the waste heat of the exhaust smoke in the boiler tail flue 1 heats the aluminum heat reservoir 2, and the aluminum heat reservoir 2 absorbs heat and conducts heat to the hot end of the thermoelectric power generation device 3 at the same time, so that a stable heat source is provided;
the cold end of the temperature difference power generation device 3 is cooled through a cooling working medium, so that the two ends of the temperature difference power generation device 3 keep constant high temperature difference;
the temperature difference between the cold and hot ends of the plurality of parallel semiconductor temperature difference generators 31 of the temperature difference power generation device 3 generates current and converges the current to the direct current convergence box 5, and then the current is continuously output to stabilize electric energy through the inverter 6 to charge the power supply battery pack, and the power supply battery pack continuously supplies power to the auxiliary equipment and the instrument.
Meanwhile, the system is built on the basis of a heat supply boiler, and the use of the heat supply boiler is mainly concentrated under the low-temperature environment in winter, so that the waste heat utilization system of the heat supply boiler provided by the invention is more suitable for running under the low-temperature environment in winter, wherein the cooler 4 connected with the cold end of the temperature difference power generation device 3 can reduce the temperature of the cooling working medium in the cooling water tank of the system by depending on the external low-temperature environment in winter, and can meet the cooling temperature requirement of the cold end of the temperature difference power generation device 3 by matching with a low-power cooling fan, so that the cooling power required by the cooling fan is greatly reduced, and the utilization rate of the waste heat of the flue gas tail channel of the heat supply boiler by the system is further improved.
Claims (10)
1. The waste heat utilization system of the heat supply boiler is characterized by comprising a plurality of aluminum heat accumulators (2) and a temperature difference power generation device (3);
one side of the aluminum heat accumulator (2) is a smooth plane and is arranged on the inner wall of the boiler tail flue (1), and the other side of the aluminum heat accumulator is provided with a plurality of H-shaped heat absorption fins;
a plurality of hot ends of the thermoelectric generation device (3) are respectively connected with the aluminum heat accumulator (2), the cold ends are connected with the cooler (4), and the output end is sequentially connected with the direct current junction station (5) and the inverter (6).
2. A waste heat utilization system of a heating boiler according to claim 1, characterized in that the thermoelectric power generation device (3) comprises a plurality of semiconductor thermoelectric generators (31) connected in parallel with each other.
3. A waste heat utilization system of a heating boiler according to claim 2, characterized in that the output ends of the plurality of semiconductor thermoelectric generators (31) are converged to the same line and connected to the input end of the direct current combiner (5).
4. A waste heat utilization system of a heating boiler according to claim 2, characterized in that the semiconductor thermoelectric generator (31) is a high-energy-efficiency semiconductor thermoelectric generator comprising bismuth telluride or tin selenide, and the inside thereof comprises a plurality of thermoelectric generation modules.
5. A system for utilizing waste heat of a heating boiler according to claim 1, characterized in that three semiconductor thermoelectric generators (31) are correspondingly arranged in cooperation with the one aluminum heat accumulator (2).
6. A waste heat utilization system of a heating boiler according to claim 1, characterized in that the cooler (4) comprises a cooling water tank with a built-in cooling working medium, and the cold end of the thermoelectric generation device (3) is arranged in the cooling water tank; the cooling working medium adopts a liquid cooler of water or low-temperature antifreezing cooling liquid.
7. A system for utilizing waste heat of a heating boiler according to claim 6, characterized in that the cooling water tank is provided with a circulation pipeline for cooling working medium, the circulation pipeline is provided with a working medium circulation pump, and the outside of the water tank is provided with a cooling fan.
8. A waste heat utilization system of a heating boiler according to claim 1, characterized in that the cooling water tank is externally provided with heat dissipating fins on which electric heating wires are arranged.
9. A heat supply station thermoelectric power generation method is characterized in that based on any one of the heat supply station thermoelectric power generation systems 1-8, the method comprises the following steps:
the waste heat of the exhaust smoke in the boiler tail flue (1) heats the aluminum heat reservoir (2), and the aluminum heat reservoir (2) absorbs heat and conducts heat to the hot end of the thermoelectric power generation device (3) at the same time, so that a stable heat source is provided;
the cold end of the temperature difference power generation device (3) is cooled through a cooler, so that the two ends of the temperature difference power generation device (3) keep constant high temperature difference and generate power continuously;
the temperature difference power generation device (3) generates current and converges the current to the direct current convergence box (5), and then stable electric energy is continuously output through the inverter (6).
10. The thermoelectric power generation method for the heating plant according to claim 9, wherein the cold ends of the plurality of semiconductor thermoelectric power generators (31) connected in parallel in the thermoelectric power generation device (3) are respectively forcibly cooled by water in a cooler or low-temperature antifreeze coolant under the action of a working medium circulating pump and a cooling fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110559286.7A CN113108361A (en) | 2021-05-21 | 2021-05-21 | Waste heat utilization system and method for heat supply boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110559286.7A CN113108361A (en) | 2021-05-21 | 2021-05-21 | Waste heat utilization system and method for heat supply boiler |
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| Publication Number | Publication Date |
|---|---|
| CN113108361A true CN113108361A (en) | 2021-07-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110559286.7A Pending CN113108361A (en) | 2021-05-21 | 2021-05-21 | Waste heat utilization system and method for heat supply boiler |
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| Country | Link |
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| CN (1) | CN113108361A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0151460A2 (en) * | 1984-02-09 | 1985-08-14 | GebràDer Sulzer Aktiengesellschaft | Space-heating system |
| JP2013002661A (en) * | 2011-06-13 | 2013-01-07 | Panasonic Environmental Systems & Engineering Co Ltd | Boiler waste heat utilization system |
| CN204328989U (en) * | 2014-12-04 | 2015-05-13 | 西安奥赛福科技有限公司 | A kind of residual heat from boiler fume recovery system |
| CN107528499A (en) * | 2017-09-05 | 2017-12-29 | 上海电力学院 | The energy storage of heat pipe-type thermo-electric generation and transmission system applied to boiler back end ductwork |
-
2021
- 2021-05-21 CN CN202110559286.7A patent/CN113108361A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0151460A2 (en) * | 1984-02-09 | 1985-08-14 | GebràDer Sulzer Aktiengesellschaft | Space-heating system |
| JP2013002661A (en) * | 2011-06-13 | 2013-01-07 | Panasonic Environmental Systems & Engineering Co Ltd | Boiler waste heat utilization system |
| CN204328989U (en) * | 2014-12-04 | 2015-05-13 | 西安奥赛福科技有限公司 | A kind of residual heat from boiler fume recovery system |
| CN107528499A (en) * | 2017-09-05 | 2017-12-29 | 上海电力学院 | The energy storage of heat pipe-type thermo-electric generation and transmission system applied to boiler back end ductwork |
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Application publication date: 20210713 |