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A kind of fly ash-based medium-temperature coal gas mercury removal adsorbent and its preparation method and application

A technology for adsorbent and fly ash, which is applied in the field of fly ash-based adsorbent and fly ash-based adsorbent for removing mercury from medium-temperature gas, can solve the problem of reducing mercury removal efficiency, large amount of activated carbon and low reaction temperature. and other problems, to achieve the effects of short preparation time, improved utilization, and fewer operation steps

Active Publication Date: 2015-10-28
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Activated carbon removes mercury by physical adsorption, so there is a problem of low reaction temperature when activated carbon is used as an adsorbent
At the same time, the mercury content in the gas is very low, and the activated carbon is easy to adsorb other substances, which reduces the efficiency of mercury removal.
Therefore, the amount of activated carbon is large and the regeneration is difficult, resulting in high cost of mercury removal.
[0006] Mercury removal from fly ash is because fly ash can enrich the mercury in the gas, forming particulate mercury that is captured by dust removal equipment to achieve the purpose of mercury removal. However, the efficiency of direct adsorption of mercury by fly ash is low. To meet the final mercury removal Requirements, but also to modify the fly ash to improve its adsorption efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh Al 2 o 3 and SiO 2 5.0g of a power plant fly ash sample with a content of 31.76wt% and 53.17wt% respectively, prepare a NaOH solution with a molar concentration of 8mol / L, and mix the NaOH solution and the fly ash sample at a volume-to-mass ratio of 10:1 ml / g Proportionally added to a 250mL reaction beaker and mixed evenly, then added an aqueous solution of palladium nitrate with a concentration of 0.22g / L, and stirred at room temperature for 10min. Then the stirred solution was moved to a reaction kettle, and reacted at 400° C. under supercritical conditions with a pressure of 25.67 MPa for 5 minutes. Cool to room temperature, suction filter, wash, and dry at 100°C for 10 hours to obtain an adsorbent product, wherein the content of PdO is 1 wt% based on the total amount of adsorbent.

[0023] The adsorbent prepared above was placed in a fixed-bed reactor to evaluate the mercury removal activity of medium-temperature gas, wherein the composition of medium-temp...

Embodiment 2

[0025] Accurately weigh Al 2 o 3 and SiO 2 5.0g of power plant fly ash with content of 31.76wt% and 53.17wt% respectively, prepare NaOH solution with molar concentration of 10mol / L, add NaOH solution to fly ash sample volume mass ratio of 10:1 ml / g to 250mL Mix well in the reaction beaker, then add 0.44 g / L palladium nitrate aqueous solution, and stir at room temperature for 10 min. Then the stirred solution was moved to a reaction kettle, and reacted for 5 minutes under the supercritical condition of 400° C. and a pressure of 25.67 MPa. Cool to room temperature, suction filter, wash, and dry at 100°C for 10 hours to obtain an adsorbent product, wherein the content of PdO is 2wt% based on the total amount of adsorbent.

[0026] The adsorbent prepared above was placed in a fixed-bed reactor to evaluate the mercury removal activity of medium-temperature gas, wherein the composition of medium-temperature gas: 0.2vol% H 2 S, 60μg / m 3 Hg, 35vol% H 2 , 30vol% CO, 5vol% CO 2...

Embodiment 3

[0028] Accurately weigh Al 2 o 3 and SiO 2 5.0g of a power plant fly ash with a content of 31.76wt% and 53.17wt% respectively, the molar concentration of the preparation is 6mol / L NaOH solution, and the volume mass ratio of NaOH solution and fly ash sample is 10:1 ml / g. Mix well in a 250mL reaction beaker, then add 0.44g / L palladium nitrate aqueous solution, and stir at room temperature for 10min. Then the stirred solution was moved to a reaction kettle, and reacted for 5 minutes under the supercritical condition of 380° C. and a pressure of 22.30 MPa. Cool to room temperature, suction filter, wash, and dry at 100°C for 10 hours to obtain an adsorbent product, wherein the content of PdO is 2wt% based on the total amount of adsorbent.

[0029] The adsorbent prepared above was placed in a fixed-bed reactor to evaluate the mercury removal activity of medium-temperature gas, wherein the composition of medium-temperature gas: 0.2vol% H 2 S, 60μg / m 3 Hg, 35vol% H2 , 30vol% CO...

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Abstract

The invention discloses a method for preparing noble metal base middle temperature gas demercuration adsorbing agent by taking the waste powder coal ash as a raw material and adopting a second / supercritical water heat synthetic technology and application of the method. The method provided by the invention comprises the following steps of mixing the waste powder coal ash in a power plant with a NaOH water solution and a noble metal precursor solution according to the certain quality volume ratio by taking the waste powder coal ash in the power plant as a main raw material, and preparing the adsorbing agent by adopting the second / supercritical water heat synthetic technology, wherein the content of the precious metal oxide accounts for 0.1-5% of the total quantity of the adsorbing agent. The method provided by the invention has the advantages that few operation steps are needed, the response time is short, the noble metal base middle temperature gas demercuration adsorbing agent is environmentally friendly and pollution-free, the load of a noble metal in a preparation process does not need any follow-up treatment, the adsorbing agent can remove the Hg0 in middle temperature gas under the high temperature, and the optimal removal efficiency of mercury can achieve 75%.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of fly ash and the field of medium-temperature gas purification, in particular to a fly ash-based adsorbent prepared by subcritical or supercritical hydrothermal synthesis, and the use of fly ash-based adsorbent to remove medium-temperature gas method of mercury. Background technique [0002] Coal gasification is the main way of coal clean utilization and the leader of clean coal technology. 2Hg in raw coal in my country 0 The content of mercury is 0.012-0.33 mg / kg. During the coal gasification process, a large proportion of difficult-to-remove elemental Hg will be released into the gas phase. Mercury will cause potential damage to the subsequent utilization of coal gas and the final ecological environment and human health. Therefore, the removal of Hg in gas has very important theoretical and practical significance. [0003] Existing studies have shown that during the coal gasification...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/10B01J20/30B01D53/02
Inventor 韩丽娜王建成李德奎任秀荣常丽萍
Owner TAIYUAN UNIV OF TECH
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