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Renewable calcium high-temperature coal gas desulfurizer

A desulfurizing agent and coal gas technology, which is applied in the fields of combustible gas purification, combustible gas purification/transformation, petroleum industry, etc. Effect

Inactive Publication Date: 2013-12-11
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the shortcomings of the existing complex preparation process of calcium-based desulfurizers, and provide a method for preparing a reproducible high-sulfur-capacity calcium-based desulfurizer

Method used

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  • Renewable calcium high-temperature coal gas desulfurizer
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  • Renewable calcium high-temperature coal gas desulfurizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0022] Embodiment 1: 300 ml of 1 mol / L Ca(NO 3 ) 2 and 100ml of 0.5 mol / L Al(NO 3 ) 3 Dubbed a mixed solution. Add the mixed precipitant of the above mixed solution and an equal volume of ammonium bicarbonate and ammonia water at a constant rate into a neutralization tank with a constant temperature of 30° C. under intense stirring. After the precipitation is completed, the precursor of the desulfurization agent is obtained after aging, filtering, washing and drying. The precursor was calcined at 900°C for 6 hours to obtain a calcium-based desulfurizer. The calcination process is carried out twice, and the desulfurizer after the first calcination is cooled outside the furnace, sealed and placed in a desiccator. For the second time, after the calcination, quickly transfer the desulfurizer to the desiccator, and keep it sealed after cooling. The calcium content of the desulfurizer obtained by the two calcinations was measured by the EDTA titration method, and the desulfuri...

Embodiment approach 2

[0025] 200 ml of 1 mol / L Ca(NO 3 ) 2 and 200ml of 0.5 mol / L Al(NO 3 ) 3 Dubbed a mixed solution. Add the mixed precipitant of the above mixed solution and an equal volume of ammonium bicarbonate and ammonia water at a constant rate into a neutralization tank with a constant temperature of 30° C. under intense stirring. After the precipitation is completed, the precursor of the desulfurization agent is obtained after aging, filtering, washing and drying. The precursor was calcined at 900°C for 6 hours to obtain a calcium-based desulfurizer. The calcination process is carried out twice, and the desulfurizer after the first calcination is cooled outside the furnace, sealed and placed in a desiccator. For the second time, after the calcination, quickly transfer the desulfurizer to the desiccator, and keep it sealed after cooling. The calcium content of the desulfurizer obtained by the two calcinations was measured by the EDTA titration method, and the desulfurization experim...

Embodiment approach 3

[0027] Embodiment 3: The desulfurization agent with a calcium content of 52.5wt% was subjected to 5 times of vulcanization and regeneration cycle experiments. The regeneration conditions are a temperature of 950°C, dilute air with an oxygen concentration of 3%, and a nitrogen-hydrogen mixture with a hydrogen concentration of 10% alternately circulating 4 times. The result is as follows:

[0028]

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Abstract

The invention relates to a preparation method of a renewable calcium high-temperature coal gas desulfurizer, belonging to the field of preparation of desulfurizers. The preparation method adopts a coprecipitation process, and comprises the following steps: preparing calcium and aluminum nitrate solutions with certain concentrations into a mixed solution according to a certain Ca / Al mol ratio; continuously and simultaneously adding a mixed solution of precipitating agent ammonia water and ammonium bicarbonate into a precipitation tank at a certain temperature at the fixed proportion of flow rate on the premise of ensuring stable precipitation conditions in the precipitation tank to carry out precipitation; and after the precipitation finishes, aging, filtering, washing, drying, calcining and the like to prepare the calcium desulfurizer. The desulfurizer has the characteristics of high sulfur capacity, simple preparation technique and the like, is renewable, and is suitable for 800-900 DEG C high-temperature coal gas desulfurization.

Description

technical field [0001] The invention relates to a preparation method of a reproducible high-temperature gas desulfurizer, belonging to the field of desulfurizer preparation. Background technique [0002] my country is one of the few countries in the world where coal is the main primary energy source, and more than 1 / 3 of the coal is used for direct combustion to generate electricity, which not only has a low utilization rate, but also causes serious environmental pollution. [0003] Integrated Gasification Combined Cycle (IGCC) is an efficient and clean advanced power generation technology. In the IGCC process, coal is first gasified by air or steam. The high-temperature gas from the gasifier usually contains 0.1%-1.5% hydrogen sulfide. Before entering the gas turbine, the gas must be purified to avoid corrosion of high-temperature operation. gas turbine. A typical coal gasification operation is above 1000°C, with an outlet temperature of 800-900°C. The traditional desulf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/04C10K1/20
Inventor 梁斌王菊蒋炜郭婧
Owner SICHUAN UNIV