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Double-stage adsorption refrigerating recycling system

A technology of adsorption refrigeration and circulation system, which is applied in the direction of refrigerators, refrigeration and liquefaction, adsorption machines, etc., to achieve the effect of facilitating large-scale industrial application, improving efficiency, and large adsorption capacity

Inactive Publication Date: 2012-09-19
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Double-stage adsorption refrigerating recycling system

Examples

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Embodiment 1

[0031] 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 first-level adsorption bed 3 is connected, and the second-level 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 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 water, and the condenser 4 passes the heat exchange medium c through the third heat exchange tube 7C...

Embodiment 2

[0040] 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 30% (mole fraction) of diethylamine and 70% (mole fraction) of triethylamine mixture; The quantity of the weak acid center of adsorbent I accounts for the ratio of surface total acid amount to be 80%; Adsorbent I microporous The pore size is between 0.3-0.6nm; the water absorption isotherm of the adsorbent I belongs to the type IV isotherm classified by Brunauer, and the adsorption heat is 45-50kJ / mol.

[0041] Adsorbent I is prepared by hydrothermal method, and 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 filtering, washing, ...

Embodiment 3

[0044] 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% (mole fraction) diethylamine and 40% (mole fraction) triethylamine; the ratio of the weak acid center 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 the adsorbent I belongs to the type IV isotherm classified by Brunauer, and the adsorption heat is 47-52kJ / mol.

[0045] Adsorbent I is prepared by hydrothermal method, and 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 2h, and adsorbent I was obtained by filtering, washing,...

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Abstract

The invention relates to a double-stage adsorption refrigerating recycling system which is characterized by consisting of a primary adsorption bed, a secondary adsorption bed, a condenser, an evaporator, a heat exchange tube, a valve and an auxiliary pipeline. Heteroatom SAPO-34 molecular sieves are filled in the primary adsorption bed; and hydrophobic silica gel, activated carbon, pure silicon molecular sieves and at least one of MCM (mesoporous crystalline material) series mesoporous silica materials are filled in the secondary adsorption bed. A desorption process of the primary adsorption bed can be greatly improved by an adsorption effect of the secondary adsorption bed of the double-stage adsorption refrigerating recycling system, and the temperature of a driving heat source of the primary adsorption bed is reduced. The double-stage adsorption refrigerating recycling system has the advantages of low desorption temperature and high adsorbent recycling adsorption quantity, reduction of the size of the system is facilitated, and the efficiency of the adsorption refrigerating system is improved.

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