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A kind of iron-based oxygen carrier based on fly ash-based porous ceramic membrane and its preparation method

A technology of porous ceramic membrane and porous ceramics, which is used in the petroleum industry, fuel additives, fuels, etc., can solve the problems of heavy metal secondary pollution, high price, carbon deposition, etc. Effect

Inactive Publication Date: 2011-11-30
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main oxygen carriers studied are oxides of transition metals such as Fe, Cu, Ni, Co, Mn, and Cd, and CaSO 4 , most of the metal oxides have the advantages of good reaction performance, good oxygen carrying capacity, continuous cycle capacity and high temperature resistance, but at the same time there are some inherent defects, such as carbon deposition at low temperature, high price, heavy metal secondary In order to improve the reaction ability, mechanical strength, service life, anti-sintering ability, specific surface area, etc. of the oxygen carrier, the oxygen carrier can be loaded on some inert substances

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Based on the iron-based oxygen carrier of fly ash base, its preparation method is as follows:

[0027] Step (1): Measure 20g of SiO as the main component 2 、Al 2 o 3 , CaO, MgO, TiO 2 、K 2 O, Na 2 The cinder of 0 is ground evenly, and the foaming agent (sawdust: particle diameter<0.1mm) that mass content is 30% of fly ash quality is added, adopts semi-dry method compression molding on the press, is pressed into the flake of φ 10 * 5mm ( The molding pressure is 30MPa).

[0028] Step (2): calcining the pressed sheet in a muffle furnace at 1100° C. for 2 hours to obtain a porous ceramic sheet of fly ash.

[0029] Step (3): the ferric nitrate (Fe(NO) of weighing 11.2g 3 ) 3 9H 2 O) Dissolve in sufficient distilled water, weigh 20g of the prepared fly ash-based porous ceramic membrane and add it to the above solution, titrate the solution to pH 9.0 with concentrated ammonia water, leave it for 12 hours after ultrasonic treatment for 5 hours, then filter and collect ...

Embodiment 2

[0034] Based on the iron-based oxygen carrier of fly ash base, its preparation method is as follows:

[0035] Step (1): Measure 20g of coal slag (same as Example 1), grind evenly, add a foaming agent with a mass percentage of 10%, press molding (semi-dry method) on a press, and press into thin slices of φ 10 × 5mm (Molding pressure is 30MPa).

[0036] Step (2): calcining the pressed sheet in a muffle furnace at 1150° C. for 2 hours to obtain a porous ceramic sheet of fly ash.

[0037] Step (3): the ferric nitrate (Fe(NO) of weighing 43.3g 3 ) 3 9H 2 O) Dissolve in sufficient distilled water, weigh 20g of the prepared fly ash-based porous ceramic membrane and add it to the above solution, titrate the solution to pH 9.0 with concentrated ammonia water, leave it for 12 hours after ultrasonic treatment for 5 hours, then filter and collect the filter residue ;

[0038] Step (4): Measure an appropriate amount of distilled water, put the filter residue obtained in step (3) into ...

Embodiment 3

[0042] Based on the iron-based oxygen carrier of fly ash base, its preparation method is as follows:

[0043] Step (1): Measure 20g of coal cinder (same as Example 1), grind evenly, add a foaming agent with a mass percentage of 20%, compression molding (semi-dry method) on a press, and press into thin slices of φ 10 × 5mm (Molding pressure is 30MPa).

[0044] Step (2): calcining the pressed sheet in a muffle furnace at 1250° C. for 2 hours to obtain a porous ceramic sheet of fly ash.

[0045] Step (3): weigh the ferric nitrate (Fe(NO 3 ) 3 9H 2 O) Dissolve in sufficient distilled water, weigh 20g of the prepared fly ash-based porous ceramic membrane and add it to the above solution, titrate the solution to pH 9.0 with concentrated ammonia water, leave it for 12 hours after ultrasonic treatment for 5 hours, then filter and collect the filter residue ;

[0046] Step (4): Measure an appropriate amount of distilled water, put the filter residue obtained in step (3) into it an...

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Abstract

The invention belongs to the technical field of chemical looping combustion, and in particular relates to a novel iron-based oxygen carrier based on a fly ash-based porous ceramic membrane and a preparation method thereof. The present invention uses Fe2O3 as an active component and a fly ash-based porous ceramic membrane as a carrier to obtain an embedded loaded film-like iron-based oxygen carrier; in the oxygen carrier, the mass percentages of Fe2O3 and the carrier are respectively 5% to 50% and 50% to 95%. The iron-based oxygen carrier prepared by using fly ash-based porous ceramic membrane as a carrier has extremely large porosity and large specific surface area, which can make Fe2O3 highly dispersed, increase the reaction area, and avoid the high temperature of Fe2O3 The sintering of the inert fly ash-based porous ceramic membrane has stable performance at high temperatures and will not react with Fe2O3, which can avoid the loss of Fe2O3 and ensure the thermal stability of the new iron-based oxygen carrier; the preparation of raw materials has a wide range of sources, and the price Low cost, friendly to the environment and other advantages, suitable for large-scale promotion.

Description

technical field [0001] The invention belongs to the technical field of chemical looping combustion, and in particular relates to a novel iron-based oxygen carrier based on a fly ash-based porous ceramic membrane and a preparation method thereof. Background technique [0002] Chemical looping combustion (CLC) technology is a new flameless combustion technology with high efficiency, cleanliness and economy. Different from the traditional combustion in which the fuel is in direct contact with the air, it uses the oxygen carrier to transfer the oxygen in the air reactor to the fuel reactor without direct contact between the fuel and the air. High concentrations of CO are generated in the fuel reactor during the process 2 , so that CO 2 separate. At the same time, it can reduce high temperature NO x generation. Chemical looping combustion technology is known for its ability to enrich CO 2 characteristics have drawn much attention. Among them, choosing an oxygen carrier wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L10/00
Inventor 覃吴董长青石司默杨勇平刘行磊
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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