Mixed working medium thermal circulating system and method for power and refrigeration cogeneration

Abstract

The invention discloses a mixed working medium thermal circulating system and method for power and refrigeration cogeneration. In the system, an ammonia and water mixture is utilized as a working medium, and the middle/low temperature heat is utilized as a heat source. The method comprises the following steps: heating the ammonia water working medium to obtain superheated steam; introducing the superheated steam into a turbine to do work; introducing the exhaust steam of the turbine into a rectification tower to supply heat for the rectification process; introducing the ammonia generated by the rectification tower into an evaporator after condensing, undercooling and throttling; throttling a dilute solution subjected to waste heat recovery, introducing the throttled dilute solution into aabsorber, mixing with the ammonia from the evaporator and condensing; and introducing a heat source into a steam generator firstly, and then introducing the heat source into a waste heat solution heat exchanger. The steam generator adopts the ammonia water strong solution as the working medium, the variable temperature evaporation feature of the ammonia water strong solution is well matched with the temperature of the heat source, thus the irreversible loss of the heat exchange process in the steam generator is reduced; simultaneously the exhaust steam of the turbine directly enters into the rectification tower to supply the rectifying heat without condensation, thus the irreversible loss caused by the variable temperature condensation of the ammonia water working medium is avoided; and the mixed type heat transfer is adopted, thus the irreversible loss of the heat exchange process is reduced.

Description

technical field [0001] The invention relates to the field of energy technology, in particular to a thermodynamic cycle system and method for a mixed working fluid combined power and cooling supply using ammonia-water mixture as a working fluid. Background technique [0002] my country's industrial energy consumption accounts for about two-thirds of the country's total energy consumption, but energy utilization efficiency is low, and more than 50% of it is discharged in the form of medium and low temperature heat, which not only causes energy waste, but also causes thermal pollution to the environment. Recycling these waste heat plays a significant role in improving my country's energy utilization efficiency. The ammonia water absorption refrigeration cycle, the ammonia water power cycle, and the combined power and cooling cycle system combining the ammonia water absorption refrigeration and power cycle are typical thermodynamic cycle systems that can utilize low-temperature ...

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Problems solved by technology

[0012] In order to overcome the shortcomings of the existing medium and low temperature waste heat utilization methods, the present invention proposes a thermodynamic cycle system and method for combined power and cold supply of mixed working fluids to solve the problem of large heat transfer temperature difference of the rectification tower reboiler in the refrigeration cycle, simplex The large heat transfer temperature difference in the evaporation process of the working fluid in the power generation cycle and the high condensation temperature of the turbine exhaust steam in the mixed working fluid power generation cycle

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