Separation device for non-condensable gas and ammonia gas in ammonia-water absorption type refrigeration system

Abstract

The invention relates to the technical field of refrigeration cycle equipment, in particular to a separation device for non-condensable gas and ammonia gas in an ammonia-water absorption type refrigeration system. The separation device comprises a condenser, an absorber, an air pump, a membrane separation element and an ammonia storage tank, wherein the membrane separation element comprises a hollow fiber membrane and a shell is filled with the hollow fiber membrane. An air inlet and an air outlet of the membrane separation element are communicated with the interior of the hollow fiber membrane, a liquid inlet and a liquid outlet of the membrane separation element are communicated with the outside of the hollow fiber membrane, the non-condensable gas in an ammonia-water absorption type refrigeration cycle is separated by the membrane separation element, a liquid phase sampling device is arranged on an outlet pipeline of the ammonia storage tank, the concentration of the ammonia liquidgenerated by the membrane separation element can be judged, and the flow direction of the ammonia liquid with different concentrations is changed by matching a guide valve, so that the recovery of refrigerant vapor is realized, the environmental protection problem caused by the non-condensable gas discharged by the ammonia-water absorption type refrigeration system is solved, a refrigerant is saved, and the refrigeration system can operate efficiently and safely.

Description

technical field [0001] The invention relates to the technical field of refrigeration cycle equipment, in particular to a separation device for non-condensable gas and ammonia gas in an ammonia water absorption refrigeration system. Background technique [0002] During the operation of the refrigeration system, it is inevitable that the system is mixed with gas that cannot be liquefied under the system condensation pressure and condensation temperature, which is called non-condensable gas. The main component of non-condensable gas is air. Its source: [0003] (1) After installing or overhauling the refrigeration equipment, before filling the refrigerant, the system is not completely evacuated, leaving air inside; [0004] (2) When replenishing refrigerant or cleaning the filter, air is mixed into the system; [0005] (3) When the evaporating pressure is lower than the atmospheric pressure, the air infiltrates into the system from the untight place; [0006] (4) Non-condensa...

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Problems solved by technology

[0008] (1) Ammonia absorption refrigeration is a closed cycle refrigeration process. The existence of non-condensable gas will reduce the cooling and liquefaction effect of ammonia; non-condensable gas will occupy the heat exchange space in the condenser, thereby reducing the condensation heat transfer efficiency. The absorption space will be occupied in the absorber, thereby reducing the absorption effect of the absorber and affecting the deflation range of the ammonia water absorption refrigeration, thus increasing the cycle rate and reducing the system refrigeration performance coefficient;

[0009] (2) The thermal resistance of non-condensable gas is very high, which hinders the heat transfer and reduces the heat transfer efficiency of the heat exchanger, resulting in insufficient heat transfer area

However, the vertical centrifugal pump in this device sucks all the concentrated solution that has been absorbed. The flow rate is large and the concentration is high, which will easily lead to cavitation and power consumption of the pump. For large-scale refrigeration systems with a large circulating flow rate of ammonia solution , this recycling method will cause a substantial increase in production costs and is not applicable

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