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Coal ash type alkali metal steam adsorbent and its preparation

An adsorbent, alkali metal technology, applied in non-metallic elements, inorganic chemistry, silicon compounds, etc., can solve problems such as difficulties, and achieve the effects of low cost, simple preparation, and improved stability

Inactive Publication Date: 2004-03-10
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the particularity and technical difficulties of alkali metal vapor removal, some research at home and abroad is limited to the selection and comparison of various adsorbents, and the patents on coal ash-type alkali metal vapor adsorbents have not yet been reported.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The high-temperature alkali metal vapor adsorbent of this implementation uses 20% of coal ash, 55% of bauxite, 8% of acid clay and 17% of ammonium carbonate as raw materials. Alkali metal vapor adsorption reaction conditions are: alkali metal vapor concentration 100-130ppm, reaction space velocity 1500hr -1 , The reaction temperature is 850°C. The adsorbent can reduce the alkali metal vapor content of the outlet gas to the allowable range, and the alkali capacity is 18.7%.

Embodiment 2

[0021] The high-temperature alkali metal vapor adsorbent used in this implementation uses 30% of coal ash, 40% of diatomite, 12% of bentonite and 18% of methyl cellulose as raw materials. Alkali metal vapor adsorption reaction conditions are: alkali metal vapor concentration 100-130ppm, reaction space velocity 1600hr -1 , The reaction temperature is 875°C. The adsorbent can reduce the alkali metal vapor content of the outlet gas within the allowable range, and the alkali capacity is 19.8%.

Embodiment 3

[0023] The high-temperature alkali metal vapor adsorbent used in this implementation uses 45% of coal ash, 30% of sepiolite, 10% of bentonite and 15% of scallop powder as raw materials, and is formed by grinding and extrusion, and roasting at a temperature of 600°C. Alkali metal vapor adsorption reaction conditions are: alkali metal vapor concentration 180-200ppm, reaction space velocity 1700hr -1 , The reaction temperature is 800°C. The adsorbent can reduce the alkali metal vapor content of the outlet gas within the allowable range, and the alkali capacity is 24.1%.

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PUM

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Abstract

The present invention discloses a kind of adsorbent for eliminating alkali metal vapor in high temperature gas and its preparation process. The said adsorbent has active component comprising mineral with SiO2 and Al2O3 as main component, and proper amount of inorganic or organic adhesive and pore expanding agent to raise the adsorption capacity of the active component, the adsorbent porosity and stability. The present invention has the features of low cost and simple preparation process, and may be used in the fields of eliminating alkali metal vapor in high temperature fuel gas and other industrial gas.

Description

technical field [0001] The invention relates to an adsorbent for removing alkali metal vapor in high-temperature gas. technical background [0002] During coal combustion and gasification, alkali metal compounds are partially released. Thermodynamic calculations show that NaCl and KCl in vapor state are the main forms of sodium and potassium in flue gas, and sulfide in flue gas can react with alkali metal chloride to form sulfate. Kinetics show that in the process of coal gasification and combustion, most of the alkali metal compounds exist in the form of chloride and sulfate under the conditions of lower than 1400K and the presence of sufficient sulfur. In the integrated gasification combined cycle (IGCC) system or other clean coal power generation technologies, the alkali metal vapor in the high-temperature gas or flue gas condenses on the surface of the heat exchanger to form a condensate film, which is in a viscous molten state. It traps solid particles in the gas, whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/10
Inventor 李依丽高晋生吴幼青
Owner EAST CHINA UNIV OF SCI & TECH
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