Inverse series triple effect absorption refrigeration system

Abstract

The invention discloses an inverting serial triple effect absorbed type refrigeration system and provides a refrigeration system which can improve the reasonable utilization of different grade energy to increase the thermal efficiency of a unit. A solution outlet of an absorption apparatus in a solution loop is connected with a solution inlet of a low-voltage generator through a low-temperature solution heat exchanger; a solution outlet of the low-voltage generator is connected with a solution inlet of a middle-voltage generator through a middle-temperature heat exchanger; a solution outlet of the middle-voltage generator is connected with a solution inlet of a high-voltage generator through a high-temperature solution heat exchanger; a solution outlet of the high-voltage generator is connected with a solution inlet of the absorption apparatus through the high-temperature solution heat exchanger, the middle-temperature solution heat exchanger and the low-temperature solution heat exchanger in turn. The dilute solution of the absorption apparatus of the refrigeration system serially backflows to the low, middle and high temperature solution heat exchangers and generators in turn and reflows to the absorption apparatus finally, thereby achieving the reasonable utilization of different grade energy and having relative high thermal efficiency of the unit.

Description

Technical field [0001] The invention relates to a refrigeration system, and more specifically, to an inverse series three-effect absorption refrigeration system. Background technique [0002] The absorption refrigeration device is driven by heat energy, using dual or multi-element working fluid pairs to realize refrigeration by the evaporation of low-boiling components (refrigerants), and the absorption of refrigerants by high-boiling components (absorbents) to complete the work cycle. At present, the most commonly used working fluid pair for absorption refrigeration devices is lithium bromide-water solution. [0003] The COP of the single-effect lithium bromide absorption chiller is 0.7, and the COP of the commonly used two-effect lithium bromide absorption chiller is increased to 1.0~1.2, but in terms of overall performance, the previous lithium bromide absorption chiller still cannot replace the traditional compression type. Cooling System. Because the direct-fired absorption ...

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Problems solved by technology

Both the parallel cycle and the positive series cycle have a disadvantage, that is, the temperature of the heated flue gas working in the high-pressure generator is high, while the mass fraction of the heated solution is low, that is, the boiling point of the heated solution is low, so the high-pressure generator The saturation temperature of the refrigerant steam generated in the cooling system is also relatively low, that is, its thermal potential is low, so it is impossible to realize the rational utilization of energy of different grades, which affects the improvement of the thermal efficiency of the unit

At this point, the forward series cycle is more obvious than the parallel cycle, the saturation temperature of the refrigerant vapor from the upper generator in the lower generator of the forward serial cycle is lower, and the heated The mass fraction of the solution is higher, that is, the boiling point of the heated solution is higher. Obviously, the rational utilization of energy of different grades cannot be realized, and the cycle thermal coefficient COP is slightly lower.

There are many hybrid circulation methods, although the COP is higher than that of series circulation and parallel circulation, but the system is relatively complex, the operation control requirements are high, and it is difficult to realize, so it is less used now

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