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Double-stage adsorption refrigerating recycling system

A technology of adsorption refrigeration and circulation system, applied in the cross field of refrigeration and air conditioning, to achieve the effect of strong water absorption, improve efficiency and reduce system volume

Inactive Publication Date: 2014-07-16
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention is mainly aimed at the low-temperature refrigeration system using ammonia as the refrigerant, and there is no report in the field of air-conditioning and refrigeration with evaporation temperature higher than 0°C

Method used

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Effect test

Embodiment 1

[0032] The two-stage adsorption refrigeration cycle system is composed of primary adsorption bed 1, secondary adsorption bed 3, condenser 4, evaporator 6, valves and other auxiliary components. The primary adsorption bed 1 is filled with adsorbent I, FeSAPO-34, and the primary adsorption bed 1 conducts heat exchange with the outside through the heat exchange medium a through the first heat exchange tube 7A; the primary adsorption bed 1 passes through the first valve 2A and the second The primary adsorption bed 3 is connected, and the secondary adsorption bed 3 is equipped with adsorbent II, fine-pore silica gel, and the quality of the fine-pore silica gel is 50% of FeSAPO-34; the secondary adsorption bed 3 passes through the heat exchange medium b through the second heat exchange The tube 7B performs heat exchange with the outside; the secondary adsorption bed 3 is further connected to the condenser 4 through the second valve 2B, and the condenser 4 is filled with refrigerant w...

Embodiment 2

[0041] In the primary adsorption bed 1 of the present invention, GaSAPO-34 adsorbent is filled, and its structural formula is 0.1R (Si 0.02 · Ga 0.40 ·Al 0.30 ·P 0.28 )·O 2 ; R is a mixture of 30% (mol fraction) of diethylamine and 70% (mol fraction) of triethylamine; the ratio of the number of weak acid centers of adsorbent I to the total surface acid content is 80%; adsorbent I microporous The pore size is between 0.3~0.6nm; the water absorption isotherm of adsorbent I belongs to the type IV isotherm classified by Brunauer, and the adsorption heat is 45~50kJ / mol.

[0042] Adsorbent I is prepared by hydrothermal method. The preparation process is as follows: 1) Weigh template agent, silicon source, aluminum source, phosphorus source, heteroatom source and water raw material according to the ratio of adsorbent I structural formula, mix and stir to form a gel ; 2) Crystallization reaction at 150°C for 50h, and adsorbent I was obtained by filtration, washing, drying and roas...

Embodiment 3

[0045] In the primary adsorption bed 1 of the present invention, FeSAPO-34 adsorbent is filled, and its structural formula is 0.4R (Si 0.35 · Fe 0.40 ·Al 0.10 ·P 0.15 )·O 2 ; The templating agent is a mixture of 60% (mol fraction) diethylamine and 40% (mol fraction) triethylamine; the ratio of the weak acid sites of the adsorbent I to the total surface acid content is 95%; the adsorbent I microporous The pore size is between 0.5-0.7nm; the water absorption isotherm of adsorbent I belongs to the type IV isotherm classified by Brunauer, and the adsorption heat is 47-52kJ / mol.

[0046] Adsorbent I is prepared by hydrothermal method. The preparation process is as follows: 1) Weigh template agent, silicon source, aluminum source, phosphorus source, heteroatom source and water raw material according to the ratio of adsorbent I structural formula, mix and stir to form a gel ; 2) Crystallization reaction at 250°C for 2 hours, and adsorbent I was obtained by filtering, washing, dry...

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Abstract

The invention relates to a two-stage adsorption refrigeration cycle system, which is characterized in that it consists of a primary adsorption bed, a secondary adsorption bed, a condenser, an evaporator, a heat exchange tube, a valve and an auxiliary pipeline. The primary adsorption bed is filled with heteroatom SAPO-34 molecular sieve; the secondary adsorption bed is filled with at least one of hydrophobic silica gel, activated carbon, pure silicon molecular sieve and MCM series mesoporous silica materials. In the two-stage adsorption refrigeration cycle of the present invention, the adsorption effect of the secondary adsorption bed can greatly promote the desorption process of the primary adsorption bed and reduce the temperature of the driving heat source of the primary adsorption bed. The two-stage adsorption refrigeration cycle of the present invention has the advantages of low desorption temperature and large adsorption capacity of the adsorbent cycle, which is beneficial to reducing the system volume and improving the efficiency of the adsorption refrigeration system.

Description

technical field [0001] The two-stage adsorption refrigeration cycle system of the present invention belongs to the technical fields of chemical engineering technology and thermal energy-driven refrigeration and air conditioning. Background technique [0002] Adsorption refrigeration technology can be driven by low-grade heat energy; the use of ammonia, water, hydrocarbon and alcohol refrigerants has no impact on the environment and has received widespread attention. At present, demonstration prototypes and small-scale products have been formed. [0003] Water is completely friendly to the environment, and its latent heat of vaporization is as high as about 2400kJ / kg, which has obvious advantages as a refrigerant. However, the adsorbents paired with water are limited to silica gel and zeolite molecular sieve, wherein the cycle adsorption capacity of silica gel is small, and the desorption temperature of zeolite molecular sieve is too high. Union Carbide Corporation of the U...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B17/08
CPCY02B30/64Y02A30/27Y02B30/00
Inventor 崔群陈海军李全国姚虎卿
Owner NANJING TECH UNIV
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