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

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...

AI Technical Summary

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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