Thermal Energy Utilization Method and Device for Using Flue Gas Waste Heat to Generate Electricity Through Molten Salt Batteries

Abstract

The invention discloses a heat energy utilization method and device for power generation through molten-salt batteries employing flue gas waste heat. With a molten salt electrolyte as a heated carrier, through drive of a molten salt circulating pump, the molten salt electrolyte with a reflux temperature t<reflux> is infiltrated into a heat exchanger arranged in a flue gas duct through a molten salt delivery pipe to collect the flue gas heat; after the temperature t of the molten salt electrolyte reaches (approaches) the flue gas temperature t(flue gas), the molten salt electrolyte is input into a molten salt battery pack, and heat energy is converted into electric energy; and after the temperature is lowered to the t(reflux), the molten salt electrolyte is infiltrated into the heat exchanger to achieve heat energy-electric energy conversion. The energy utilization rate can reach over 30%; total energy utilization is not limited and is not affected by regional and seasonal changes; the waste heat energy of industrial production can be recycled relatively efficiently; the targets of energy conservation and emission reduction of our country can be relatively well achieved; and the molten-salt battery-based waste heat utilization technology is suitable for flue gases of large industrial furnaces.

Description

technical field [0001] The invention relates to the technical field of waste heat utilization based on molten salt batteries, in particular to a heat energy utilization method and a device thereof which use waste heat of flue gas to generate electricity through molten salt batteries. Background technique [0002] Effective use of waste heat from high-energy-consuming enterprises is an important method for countries and industries in the world to achieve energy conservation and emission reduction in recent years. ℃), the traditional technology cannot realize high-efficiency utilization, and the obtained energy utilization rate is only below 10%. Although the other waste heat has a higher temperature, it cannot How to realize the efficient utilization of waste heat in enterprises has become the long-term goal of industrial production. [0003] There are mostly two types of existing flue gas waste heat utilization: [0004] 1. Use the waste heat of the flue gas to heat hot wa...

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Problems solved by technology

[0004] 1. Use the waste heat of the flue gas to heat hot water or other media, and use the hot water for heating or bathing. This method can improve the utilization rate of absorbed heat energy, but this kind of waste heat utilization is a low-end utilization method, and the energy utilization range is limited. Affected by regions and seasons, it is only worth promoting in northern winter, and the total energy utilization is limited

[0005] 2. Use low-boiling point substances (such as freon, etc.) as the heat medium, and use the calorie cycle to drive the power machinery to generate power. The current heat utilization rate of this method is less than 10% of the heat energy absorbed by the heat medium, which is far lower than the waste heat. Energy, although this method produces high-grade energy, but the utilization rate of heat energy is too low

[0006] Therefore, the existing technology is still not ideal

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