Low-temperature heat source efficient absorption refrigerator and refrigeration method thereof

Abstract

The invention discloses a low-temperature heat source efficient absorption refrigerator and a refrigeration method thereof. The low-temperature heat source efficient absorption refrigerator comprises a generator, a condenser, an evaporator, an absorber, a compressor 1, a compressor II, a cooling water pipe I, a cooling water pipe II, a cold water pipe and a heat source, wherein the generator is connected with the compressor I by a pipeline I, the compressor I is connected with the condenser by a pipeline II, the bottom of the generator is provided with a pipeline 7 connected with a spraying device in the absorber, the condenser is connected with the evaporator by a pipeline 3, the evaporator is connected with the compressor II by a pipeline 4, the compressor II is connected with the absorber by a pipeline 5, the absorber is connected with the generator by a pipeline 6, the cooling water pipe I is arranged in the condenser, the cold water pipe is arranged in the evaporator, the cooling water pipe II and the spraying device are arranged in the absorber, and the heat source is arranged outside the generator. According to the low-temperature heat source efficient absorption refrigerator, the compressors I and II are arranged between the generator and the evaporator and between the evaporator and the absorber of the low-grade-energy drive CO2 absorption refrigeration system, the pressure intensity in the generator and the evaporator is reduced while the pressure intensity in the condenser and the absorber is increased due to the action of the condenser, so that liquid turns into gas or gas turns into liquid more easily. Therefore, the requirements on the temperature of the heat source of the generator and the temperature of cooling water in the condenser are reduced, so that refrigeration circulation can be carried out with the temperature of the heat source not necessarily high and the temperature of the cooling water not necessarily low, the heat energy consumption is reduced and the efficiency is increased, the temperature of the whole circulation process is increased, and the equipment is effectively prevented from being corroded by a lithium bromide solution at the high temperature.

Description

technical field [0001] The invention relates to an absorption refrigerating machine, in particular to a high-efficiency absorption refrigerating machine with a low-temperature heat source. [0002] The present invention also relates to a refrigeration method using the refrigerator described above. Background technique [0003] In the prior art, the absorption refrigerating machine is usually powered by heat energy, uses water as the refrigerant, and lithium bromide solution as the absorbent, and utilizes the principle of absorption to realize refrigeration. It consists of multiple components such as generator, condenser, evaporator, absorber and heat exchanger. According to the type of driving heat source, it can be divided into steam type, direct combustion type, hot water type, etc. For low-temperature (below 100°C) hot water as the driving heat source, single-effect absorption chillers are common in the market, and it is more common to use chillers for waste hot water b...

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Problems solved by technology

[0004] (1) The heat source requirements are too high: the heat source must adopt a certain temperature, such as waste heat source water higher than 90 °C to evaporate the water in the lithium bromide solution, and many living cost heat sources cannot be effectively used at lower temperatures, such as 40 -90°C heat source

[0005] (2) The conversion efficiency of the heat source is low: since the liquid turns into gas in the generator and evaporator, the pressure in the generator and evaporator is reduced, making it more difficult for the liquid to turn into gas, and the same is true in the condenser and absorber As the gas turns into a liquid, the pressure decreases, which prevents the gas from further changing into a liquid, thus reducing the overall conversion efficiency

[0006] (3) Due to the high working temperature, lithium bromide will cause more serious corrosion of equipment

[0007] (4) It is impossible to make full use of the cooling water that has absorbed the heat converted from gas to liquid, and the temperature rises

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