Calcium-based CO2 adsorbent and preparing method thereof

An adsorbent, calcium-based technology, applied in the field of calcium-based CO2 adsorbent and its preparation, can solve the problems of poor circulation stability of calcium oxide adsorbent, loss of active calcium oxide adsorbent, unfavorable fluidization of adsorbent particles, etc. The granulation method is simple and easy to implement, improves the cycle stability, and the effect of good CO2 adsorption capacity.

Active Publication Date: 2016-07-06
HUAZHONG UNIV OF SCI & TECH
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  • Claims
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Problems solved by technology

[0003] The calcium-based CO used in the prior art 2 The main component of the adsorbent is calcium oxide, but there are two obvious problems when the adsorbent is applied to the calcium circulation system: one is that the cycle stability of the calcium oxide adsorbent is poor, and the second is that the calcium oxide adsorbent is in the carbonation furnace and In the process of circulating fluidization between calciners, the influence of particles and particles, particles and pipes, and thermal stress can easily cause the wear of the adsorbent, resulting in the loss of activated calcium oxide adsorbent
Among the granulation methods, extrusion granulation and rotary spheronization are two of the most common granulation methods; however, the cylindrical shape of the adsorbent particles obtained only by extrusion is not conducive to fluidization, and only by Adsorbent particles obtained by rotary spheronization have poor wear resistance
However, in the doping method, the amount of the doping substance usually needs to be 5% to 20%, which causes the increase of the preparation cost.

Method used

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  • Calcium-based CO2 adsorbent and preparing method thereof
  • Calcium-based CO2 adsorbent and preparing method thereof

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preparation example Construction

[0028] The Ca-based CO 2 The preparation method of adsorbent comprises the following steps:

[0029] (1) Evenly mix the algae raw material, water and calcium-based raw material with a mass ratio of 0.001:0.1:1 to 0.03:0.45:1 to obtain a mixed material; wherein the calcium-based raw material is calcium hydroxide, calcium carbonate or slaked lime One or more of them, the particle size of which is less than 200 μm;

[0030] (2) extruding and spheronizing the mixed material to obtain a spherical mixed material with a diameter less than 4mm;

[0031] (3) Dry the spherical mixture (such as air-drying or drying for 5h-10h below 60°C, so as not to cause the adsorbent to react with CO in the air if the temperature is too high. 2 reaction to affect its adsorption performance) and sieve out spherical particles with a diameter of 0.3 mm to 3.5 mm to obtain the calcium-based CO 2 Adsorbent.

[0032] Wherein, the extrusion spheronization of the step (2) is usually operated by an extrusi...

Embodiment 1

[0033] Example 1 Preparation of calcium oxide-based adsorbent pellets doped with microalgae

[0034] (1) Add 15ml of deionized water to 40g of calcium hydroxide powder with a particle size of less than 150 μm and 0.2g of microalgae powder and stir well.

[0035] (2) Pass the obtained wet material through a single-screw extruder, the aperture of the extrusion template is 1mm, and the extrusion speed is 30r / min, to obtain long cylindrical adsorbent particles. Then, put the long cylindrical particles into the spheronizer, first set the speed at 1400r / min and last for 2min, cut the long cylindrical calcium oxide particles at 1400r / min2min into short cylindrical particles, then reduce the speed to 1000r / min and last for 5min , Roll short cylindrical particles into calcium oxide pellets.

[0036] (3) Finally, the obtained calcium oxide pellets are screened through a standard sieve, and the pellets with a particle size range of 0.9 mm to 1.25 mm are placed in the air to dry for 24 h...

Embodiment 2

[0037] Example 2 Preparation of calcium oxide-based adsorbent pellets doped with microalgae

[0038]Repeat Example 1 with the same steps described, the difference is that the quality of the microalgae powder is 0.4g.

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Abstract

The invention discloses calcium-based CO2 adsorbent.The calcium-based CO2 adsorbent is spherical particles with the diameter of 0.3-3.5 mm and are prepared from an alga raw material and a calcium-based raw material which are mixed uniformly by the mass ratio of 0.001:1-0.03:1.The calcium-based raw material is one or more of calcium hydroxide, calcium carbonate or slaked lime.The invention further discloses a preparing method of the calcium-based CO2 adsorbent.0.1-3% of the alga raw material is doped in the calcium-based raw material, a pelleting method is optimized, cycling stability of the calcium-based CO2 adsorbent is improved, and the preparing method is simple and suitable for mass production.

Description

technical field [0001] The invention belongs to CO 2 The field of adsorbents, more specifically, relates to a calcium-based CO 2 Sorbent and method for its preparation. Background technique [0002] CO emissions from fossil fuel use 2 considered to be the main cause of global warming. To make the use of fossil fuels environmentally acceptable, a range of CO 2 Capture and storage technologies have been developed. Among them, the calcium cycle CO 2 Capture technology is considered to be one of the most promising CO2 capture technologies due to its low capture cost and wide applicability. 2 capture technology. [0003] The calcium-based CO used in the prior art 2 The main component of the adsorbent is calcium oxide, but there are two obvious problems when the adsorbent is applied to the calcium circulation system: one is that the cycle stability of the calcium oxide adsorbent is poor, and the second is that the calcium oxide adsorbent is in the carbonation furnace and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30B01J20/28B01D53/02B01D53/81B01D53/62
CPCB01D53/02B01D53/62B01D53/81B01D2251/404B01D2251/604B01D2253/102B01D2253/112B01D2257/504B01J20/041B01J20/043B01J20/20B01J20/28019B01J2220/42B01J2220/4806Y02C20/40
Inventor 刘文强孙健徐明厚陈洪强杨新伟胡迎超王文煜
Owner HUAZHONG UNIV OF SCI & TECH
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