Wide and narrow passage plate type flooded generator and falling film absorber, and ammonia water absorption refrigerator

Abstract

The invention discloses a wide and narrow passage plate type flooded generator, a wide and narrow passage plate type falling film absorber and an ammonia water absorption refrigerator. Waste heat passes through wide waste heat passages of the wide and narrow passage plate type flooded generator and then are used for heating concentrated ammonia water reversely flowing from narrow concentrated ammonia water passages to generate a gas-liquid mixture entering a gas-liquid separator, water-containing ammonia is separated and is condensed to form liquid ammonia in a plate type condenser after being purified by a fractional condenser, and the liquid ammonia is delivered into a liquid ammonia tank; liquid ammonia discharged from the liquid ammonia tank enters a heat exchange tube of a subcooler, and is supplied to a plate type evaporator and evaporated to form cold ammonia after being subjected to further heat exchange with cold ammonia discharged from the plate type evaporator, the cold ammonia enters the subcooler to be subjected to further heat exchange with the liquid ammonia in the heat exchange tube, enters a concentrated ammonia water outlet header on the lower part of the wide and narrow passage plate type falling film absorber under the action of differential pressure, rises along narrow diluted ammonia water passages, and is absorbed by diluted ammonia water which is discharged from the gas-liquid separator and cooled by a solution heat exchanger to form concentrated ammonia water, and the concentrated ammonia water enters a concentrated ammonia water tank, and is pumped into the wide and narrow passage plate type flooded generator through a solution pump.

Description

technical field [0001] The invention relates to an ammonia water absorption refrigerator driven by waste heat of a wide-narrow channel plate-type flooded generator and a wide-narrow channel plate-type falling film absorber, and relates to the technical field of waste heat refrigeration. Background technique [0002] The generator and absorber of existing ammonia water absorption refrigerators use traditional shell-and-tube heat exchangers, which have disadvantages such as high manufacturing cost, low heat transfer efficiency, slow cooling, slow response to changes in heat source and cooling water, and large volume. The flooded generator of a traditional ammonia water absorption refrigerator adopts a shell-and-tube structure. The concentrated ammonia water fills the shell-side, and the waste heat goes to the tube-side. The direction of the generator cannot be completely reversed, resulting in low heat transfer efficiency of the shell-and-tube flooded generator, increasing its...

AI Technical Summary

Problems solved by technology

[0002] The generator and absorber of the existing ammonia water absorption refrigerator adopt the traditional shell-and-tube heat exchanger, which has the disadvantages of high manufacturing cost, low heat transfer efficiency, slow refrigeration, slow response to changes in heat source and cooling water, and large volume.

The flooded generator of the traditional ammonia water absorption refrigerator adopts a shell-and-tube structure. The concentrated ammonia water is filled with the shell-side, and the waste heat goes to the tube-side. The direction of the generator cannot be completely reversed, resulting in low heat transfer efficiency of the shell-and-tube flooded generator, increasing its heat transfer area and volume, high manufacturing costs, and large volume of concentrated ammonia on the shell side The phenomenon of large amount of waste heat heating the concentrated ammonia water on the shell side takes a long time, and the unit starts slowly. When the waste heat fluctuates, the temperature fluctuation of the concentrated ammonia water is not obvious, and the response of the slow unit is not timely.

The absorber of the traditional ammonia water absorption refrigerator adopts the flooded bubbling shell-and-tube type or the falling-film shell-and-tube type. The heat transfer efficiency of the absorber of the two structures is low, the heat transfer area is large, and the manufacturing cost is high.

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