A dual-pressure evaporating ammonia water power cycle power generation device

Abstract

The invention relates to a dual-pressure evaporation ammonium hydroxide power circulation power generation device. A sub-high-pressure ammonia water pump P3, a second preheater PH2 and a second evaporator E2 are additionally arranged on the basis of a Kalimna circulation power generation device, and a second turbine inlet is formed; the dual-pressure evaporation ammonium hydroxide power circulation power generation device is used for absorbing waste heat of a low-temperature section of a heat source to generate sub-high-pressure steam which enters a turbine for power generating; and the heat source is used in a gradient manner, namely the heat source heats working solutions in undercooling sections of the second evaporator and a first evaporator which are arranged in parallel at the same time after evaporation through the first evaporator and heat discharging of an overheating section, and the irreversible losses of a sensible heat source and the heat transfer temperature difference of a working medium are smaller. By means of the dual-pressure evaporation ammonium hydroxide power circulation power generation device, the generated power recovery efficiency of medium-high temperature waste heat can be improved by 20%.

Description

technical field [0001] The invention relates to a power generation device, in particular to a dual-pressure evaporation ammonia water power cycle power generation device. Background technique [0002] Many industrial processes generate large amounts of sensible, moderate to high temperature waste heat. Due to the large temperature change in the exothermic process, the isothermal endothermic process in the ordinary pure working fluid power cycle does not match it. Under the limitation of node temperature difference, there is a large irreversible loss of heat transfer temperature difference. The mixed working fluid of ammonia and water can overcome the disadvantages of high boiling point of water and low boiling point of pure ammonia, and can adjust the working pressure to an appropriate range. The Kalina cycle power generation device using ammonia-water mixed working fluid can achieve a better match between the working fluid and the heat release process of the sensible heat ...

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Problems solved by technology

However, calculations also show that for medium-high temperature waste heat above 350°C, limited by the temperature difference of the phase transition of the working medium, usually the only way to adapt to the increase in waste heat temperature is to increase the degree of superheat (increase the pressure, and the discharge temperature of the heat source will be higher), so that the single The temperature matching between the working fluid and the heat source of the pressure-evaporated Kalina cycle power plant is also poor

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