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Method and device for power generation by utilizing low-temperature waste heat

A liquid inlet and electrode liquid technology, applied in circuits, fuel cells, electrical components, etc., can solve problems such as large water consumption, limited application areas, and increased power generation costs, achieving low water consumption, wide application areas, and power generation. low cost effect

Active Publication Date: 2014-07-02
TSINGHUA UNIV
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Problems solved by technology

But there are following two main problems in this technology: (1) water consumption is big, application area is limited
Therefore, this technology is only applicable to areas with sufficient concentration and fresh water, such as the estuary of river water
(2) In addition, in practical applications, the transportation of river water and sea water will greatly increase the cost of power generation

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  • Method and device for power generation by utilizing low-temperature waste heat

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Embodiment 1

[0027] Embodiment 1. Method and device for generating electricity using low-temperature waste heat

[0028] figure 1 It is a schematic diagram of the principle and device structure of the process of utilizing low-temperature waste heat for power generation in the present invention. The device is mainly composed of RED module 1 , distillation column 2 and heat exchanger 3 . Among them, the RED module 1 is mainly composed of a cathode 6, an anode 7, a cation exchange membrane 4 and an anion exchange membrane 5, and the module is provided with a cathode chamber A, a concentrated water chamber B, a fresh water chamber C and an anode chamber D. Both the cathode 6 and the anode 7 are titanium plates coated with ruthenium and iridium. The concentrated ammonium bicarbonate solution 8 and the dilute ammonium bicarbonate solution 9 flow through the concentrated water chamber B and the fresh water chamber C respectively, and the solutions are delivered by a peristaltic pump 12 .

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Abstract

The invention discloses a method for power generation by utilizing low-temperature waste heat and a special device for the method. The device comprises a reverse electrodialysis (RED) module, a distillation column and a heat exchanger, wherein an ammonium bicarbonate solution serves as a working liquid. A concentrated ammonium bicarbonate solution and a diluted ammonium bicarbonate solution respectively flow into a concentrated solution chamber and a diluted solution chamber of the RED module, and anions and cations migrate under the pushing of a concentration difference to realize power generation. Effluent of the diluted ammonium bicarbonate solution flows into the distillation column, and added ammonium bicarbonate is separated and introduced into effluent of the concentrated ammonium bicarbonate solution in the forms of ammonia and carbon dioxide to realize the regeneration of the ammonium bicarbonate solution. The regenerated diluted ammonium bicarbonate solution is cooled and then flows back to the RED module along with the regenerated concentrated ammonium bicarbonate solution so as to complete a power generation cycle. The method disclosed by the invention has the advantages that energy efficiency is not limited by the temperature of a heat source, and the method is particularly suitable for recycling the low-temperature waste heat; meanwhile, water consumption is low and the application region is wide; and in addition, the power generation cost is low, and a process is simple and is easy to operate.

Description

technical field [0001] The invention relates to a method and a device for generating electricity by using low-temperature waste heat. Background technique [0002] In recent years, with the rapid development of industrial society, the problems of environmental pollution and energy crisis have become increasingly serious around the world. Therefore, renewable energy has gradually attracted human attention. Low-temperature waste heat is a potential renewable energy source with a huge amount. According to statistics, low-temperature waste heat is about 50% of the heat energy released by human industrial production. Currently commonly used waste heat power generation technologies are based on several traditional thermodynamic cycles, such as organic Rankine cycle, Karina cycle and so on. The energy efficiency of these processes is limited by the temperature of the heat source, so waste heat below 100 °C is not suitable for recycling by these technologies. [0003] Reverse el...

Claims

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Application Information

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IPC IPC(8): H01M8/22H01M8/04H01M8/04029
CPCY02E60/50Y02P70/50
Inventor 黄霞罗希梁鹏曹效鑫肖康
Owner TSINGHUA UNIV
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