CN-122026747-A - Carbon dioxide gasification pipeline thermoelectric generation system

Abstract

The invention discloses a carbon dioxide gasification pipeline thermoelectric power generation system, which relates to the technical field of energy recovery and thermoelectric power generation and comprises a low-temperature supercritical storage unit, a conveying tunnel unit, a thermoelectric power generation unit and an electric energy processing unit, wherein the low-temperature supercritical storage unit is a low-temperature air tank, low-temperature supercritical carbon dioxide is stored in the low-temperature air tank, the conveying tunnel unit is a low-temperature tunnel, the inlet end of the low-temperature tunnel is communicated with the outlet of the low-temperature air tank, and a semiconductor thermoelectric power generation component is arranged in a mounting cavity formed by a heat preservation layer and a conveying pipeline in a modularized manner.

Inventors

• LU MING
• LU MEI

Assignees

• 河北聚蓝科技发展有限公司

Dates

Publication Date

20260512

Application Date

20260114

Claims (7)

1. 1. The carbon dioxide gasification pipeline thermoelectric power generation system is characterized by comprising a low-temperature supercritical storage unit, a conveying tunnel unit, a thermoelectric power generation unit and an electric energy processing unit; the low-temperature supercritical storage unit is a low-temperature gas tank, and low-temperature supercritical carbon dioxide is stored in the low-temperature gas tank; The conveying tunnel unit is a low-temperature tunnel, the inlet end of the low-temperature tunnel is communicated with the outlet of the low-temperature gas tank, and a conveying pipeline is arranged in the low-temperature tunnel and used for conveying low-temperature supercritical carbon dioxide; the semiconductor thermoelectric power generation assembly is embedded into the inner side wall of the low-temperature tunnel, the low-temperature end of the semiconductor thermoelectric power generation assembly is contacted with the outer wall of the conveying pipeline, and the high-temperature end is contacted with the normal-temperature environment outside the low-temperature tunnel; The electric energy processing unit is electrically connected with the semiconductor thermoelectric generation assembly and is used for processing and outputting the generated electric energy; wherein the inner side wall of the low-temperature tunnel is provided with an insulating layer, an installation cavity is formed between the insulating layer and the conveying pipeline, the semiconductor thermoelectric generation assembly is arranged in the mounting cavity; a graphene heat conducting sheet is arranged between the low-temperature end of the semiconductor thermoelectric generation assembly and the outer wall of the conveying pipeline; The high-temperature end of the semiconductor thermoelectric power generation assembly is connected with a soaking plate, the soaking plate extends to the outside of the low-temperature tunnel, and radiating fins are arranged on the outer surface of the soaking plate.
2. 2. The carbon dioxide gasification pipeline thermoelectric power generation system according to claim 1, wherein the semiconductor thermoelectric power generation assembly is formed by connecting a plurality of semiconductor thermoelectric power generation sheets in series or in parallel, wherein a single power generation sheet adopts bismuth telluride-antimony-based substitution solid solution material, and the thermoelectric figure of merit ZT in a temperature range of-60 ℃ to 40 ℃ is more than or equal to 0.8.
3. 3. The carbon dioxide gasification pipeline thermoelectric generation system according to claim 1, wherein the heat preservation layer is a vacuum heat insulation plate, and the thickness is 30-60mm.
4. 4. The carbon dioxide gasification pipeline thermoelectric generation system according to claim 1, wherein the thickness of the graphene heat conduction sheet is 0.1-0.3mm, and the heat conduction coefficient is ⩾ W/(m·k).
5. 5. The carbon dioxide gasification pipeline thermoelectric generation system according to claim 1, wherein the heat dissipation fins are made of copper, and the sheet spacing is 3-5mm.
6. 6. The carbon dioxide gasification pipeline thermoelectric generation system according to claim 1, wherein the electric energy processing unit comprises a voltage stabilizing circuit, a charging management circuit, a storage battery pack and a direct current-alternating current conversion circuit which are electrically connected in sequence, and the output voltage of the direct current-alternating current conversion circuit is 220V, and the frequency of the direct current-alternating current conversion circuit is 50Hz.
7. 7. The carbon dioxide gasification pipeline thermoelectric generation system according to claim 1, wherein the length of the low-temperature tunnel is 5-50m, a group of semiconductor thermoelectric generation components are arranged at intervals of 0.5-1m along the length direction of the conveying pipeline, and the power generation of each group of components is 10-20W.

Description

Carbon dioxide gasification pipeline thermoelectric generation system Technical Field The invention relates to the technical field of energy recovery and thermoelectric generation, in particular to a carbon dioxide gasification pipeline thermoelectric generation system. Background The method is in the technical field of energy recovery and thermoelectric generation. Along with the increasing global demand for sustainable energy solutions, how to efficiently utilize waste heat energy or cold energy generated in industrial processes has become one of the key directions of technical development, and supercritical carbon dioxide is used as a high-efficiency heat transfer medium to carry a large amount of underutilized cold energy in the processes of low-temperature storage and transportation, and meanwhile, the thermoelectric generation technology has the characteristics of no moving parts, low maintenance requirement and strong environmental adaptability. The method has great potential in the field of low-temperature energy recovery. However, the prior art still faces a core challenge in practical application, namely, how to stably maintain the temperature gradient across the thermoelectric generation assembly, so as to realize continuous and efficient electric energy output. However, in the practical application scenario of the supercritical carbon dioxide conveying tunnel, the heat exchange process between the conveying pipeline and the external environment is complex and changeable, the high-temperature end of the power generation component is easily affected by the fluctuation of the external environment temperature due to the lack of effective hot end and cold end isolation and enhanced heat transfer mechanism in the traditional thermoelectric power generation system, and the required temperature difference is difficult to maintain due to the fact that the cold quantity of the pipeline is too fast to be dissipated at the low-temperature end, for example, when the external environment temperature rises, the temperature of the high-temperature end of the power generation component rises, and the cold quantity is leaked due to the fact that the heat preservation of the pipeline is insufficient at the low-temperature end, so that the temperature difference at two ends is obviously reduced, the power generation efficiency is greatly reduced, and the instability of the temperature difference directly limits the long-term reliable operation and the power output quality of the thermoelectric power generation system in the industrial scenario, so that improvement is needed. Disclosure of Invention The invention aims to provide a carbon dioxide gasification pipeline thermoelectric power generation system, which is used for solving the problems that in the prior art, the temperature gradient at two ends of a thermoelectric power generation assembly is difficult to stably maintain, so that the power generation efficiency is low and the operation is unreliable. In order to achieve the aim, the invention provides the technical scheme that the carbon dioxide gasification pipeline thermoelectric power generation system comprises a low-temperature supercritical storage unit, a conveying tunnel unit, a thermoelectric power generation unit and an electric energy processing unit; the low-temperature supercritical storage unit is a low-temperature gas tank, and low-temperature supercritical carbon dioxide is stored in the low-temperature gas tank; The conveying tunnel unit is a low-temperature tunnel, the inlet end of the low-temperature tunnel is communicated with the outlet of the low-temperature gas tank, and a conveying pipeline is arranged in the low-temperature tunnel and used for conveying low-temperature supercritical carbon dioxide; the semiconductor thermoelectric power generation assembly is embedded into the inner side wall of the low-temperature tunnel, the low-temperature end of the semiconductor thermoelectric power generation assembly is contacted with the outer wall of the conveying pipeline, and the high-temperature end is contacted with the normal-temperature environment outside the low-temperature tunnel; The electric energy processing unit is electrically connected with the semiconductor thermoelectric generation assembly and is used for processing and outputting the generated electric energy; wherein the inner side wall of the low-temperature tunnel is provided with an insulating layer, an installation cavity is formed between the insulating layer and the conveying pipeline, the semiconductor thermoelectric generation assembly is arranged in the mounting cavity; a graphene heat conducting sheet is arranged between the low-temperature end of the semiconductor thermoelectric generation assembly and the outer wall of the conveying pipeline; The high-temperature end of the semiconductor thermoelectric power generation assembly is connected with a soaking plate, the soaking plate extends to the outside of the