Method for preparing zeolite molecular sieve single finned tube for sintering shell type adsorbent bed

A technology of zeolite molecular sieve and sintered zeolite, which is applied in absorbent/adsorbent, chemical instruments and methods, refrigerators, etc., can solve the problems of large contact thermal resistance, etc., and achieves increasing filling amount, increasing heat exchange area, and enhancing uniformity Effect

Inactive Publication Date: 2008-10-01
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

"Journal of Engineering Thermophysics" (2006, 1: 139-141) "Design of Adsorption Unit Tube for Adsorption Refrigeration and Research on Heat and Mass Transfer Performance" uses the method of stacking bulk zeolite particles in the finned tube to strengthen the transfer of the adsorption bed. heat, which improves the uniformity of the temperature field, but the thermal conductivity of the adsorbent is only 0.07Wm -1 K -1 , the contact thermal resistance is also larger

Method used

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  • Method for preparing zeolite molecular sieve single finned tube for sintering shell type adsorbent bed

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Experimental program
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Effect test

Embodiment 1

[0028] 1.1 Raw material ratio: use pure 13X type zeolite raw powder, add attapulgite with 8% mass of zeolite raw powder, kaolin with 2% mass of zeolite raw powder, and graphite powder with 4% mass of zeolite raw powder, stir evenly as adsorbent raw material. Then, add water glass with a modulus of 3.2 mixed with water as a binding agent, the mass ratio of water glass to water is 2:1, and the mass ratio of adsorbent raw material to binding agent is 3:2. Stir evenly to obtain a composite adsorbent.

[0029] 1.2 Pre-treatment and pre-curing: open 4 V-shaped vertical grooves on the finned tube treated with an ultrasonic cleaner, pre-fill the V-shaped mold in the vertical grooves, and then fill the fins with the composite adsorbent prepared in 1.1, apply The annular mold is pressurized at 5-10 MPa, and the mold is removed.

[0030] 1.3 Baking and drying: Sinter the finned tube as a whole, heat it at 40°C, 70°C, and 100°C for 50 minutes, at 140°C and 180°C for 40 minutes each, and...

Embodiment 2

[0033] 2.1 Raw material ratio: use 13X type zeolite raw powder and granules to mix, the mass ratio of the two is 1:1, add attapulgite with 10% mass of zeolite raw powder, kaolin with 2% mass of zeolite raw powder, and zeolite raw powder 5% graphite powder, stirred evenly as the raw material of the adsorbent. Then, add water glass with a modulus of 3.2 mixed with water as a binding agent, the mass ratio of water glass to water is 2:1, and the mass ratio of adsorbent raw material to binding agent is 3:2. Stir evenly to obtain a composite adsorbent.

[0034] 2.2 Pre-treatment and pre-curing: open 4 rectangular longitudinal slots on the finned tube treated with an ultrasonic cleaner, pre-fill a rectangular mold in the longitudinal slot, then fill the fins with the composite adsorbent prepared in 2.1, and apply a ring mold Pressurize at 5-10MPa, and remove the mold.

[0035] 2.3 Baking and drying: Sinter the finned tube as a whole, heat it at 50°C and 90°C for 50 minutes, heat at...

Embodiment 3

[0038] 3.1 Raw material ratio: use pure 13X zeolite particles as the raw material of the adsorbent, add water glass with a modulus of 3.2 mixed with water as the binder, the mass ratio of water glass and water is 2:1, the raw material of the adsorbent and the binder The mass ratio is 3:1. Stir evenly to obtain a composite adsorbent.

[0039]3.2 Pre-treatment and pre-curing: open 3 V-shaped longitudinal grooves on the finned tube treated with an ultrasonic cleaner, pre-fill the V-shaped mold in the longitudinal grooves, and then fill the fins with the composite adsorbent prepared in 3.1, apply The annular mold is pressurized at 5-10MPa, and the mold is removed.

[0040] 3.3 Baking and drying: Sinter the finned tube as a whole, heat it at 40°C and 90°C for 50 minutes, heat it at 140°C and 180°C for 30 minutes each, and keep it warm at 200°C After 1.5 hours, air-cool to obtain a sintered zeolite molecular sieve finned single tube.

[0041] Compared with the bulk zeolite partic...

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Abstract

The invention relates to a fin adsorption single tube which disposably and integrally sinters zeolite molecular sieves with low temperature on a fin pipe and leads the zeolite molecular sieves to be solidified and formed, and realizes the combination of sintering of composite adsorbent and solidification of the composite adsorbent and the fin pipe wall. The fin adsorption single tube of the invention replaces light pipe sintering with the fin pipe, improves the filling quantity of the adsorbent on the unit length pipe wall and increases the heat exchanging area; the adsorbent adopted by the invention has high thermal conducting coefficient, has small resistance of the contact with the metal wall surface and fast mass transfer speed, thus improving the heat transmission and mass transfer performance of an adsorption bed, increasing the adsorption circulation quantity, and shortening the circulation time.

Description

technical field [0001] The invention relates to an adsorption bed single tube with excellent heat transfer and mass transfer performance, in particular to an adsorption bed single tube in which a zeolite molecular sieve is integrally sintered at low temperature on a finned tube to be solidified and formed. The invention belongs to the field of adsorption refrigeration enhanced heat transfer and mass transfer. technical background [0002] Shell-and-tube adsorption bed is a commonly used form of adsorption bed in adsorption refrigeration, and zeolite molecular sieve and water are commonly used working fluid pairs in adsorption refrigeration. The filling method is mostly to pile up zeolite particles in bulk around the outer wall of the smooth tube as the heat transfer tube. However, zeolite molecular sieve is a porous medium material with low thermal conductivity. For example, the thermal conductivity of a packed bed of zeolite particles is only 0.06-0.09Wm -1 K -1 . At th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/18B01J20/28B01J20/30F25B37/00F25B17/08
Inventor 王学生从建立孟祥睿韦小雄胡放张如波曾方薇
Owner EAST CHINA UNIV OF SCI & TECH
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