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Coal-fired flue gas mercury removal adsorbing agent and preparation method and application thereof

A coal-fired flue gas and adsorbent technology, which is applied in the field of coal-fired flue gas mercury removal adsorbent and its preparation, can solve the problems of low adsorption efficiency, narrow action temperature range, and high price, so as to improve adsorption capacity and increase active points , Strong adsorption effect

Inactive Publication Date: 2016-04-20
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mercury adsorbents currently in commercial operation are mainly carbon-based adsorbents such as activated carbon. This type of adsorbent has the following characteristics: 1) High adsorption efficiency and strong saturated adsorption capacity after modification; 2) High price; 3) Impact The carbon content of fly ash affects the recycling of fly ash (cement production); 4) The temperature range of action is narrow, and the temperature range that can maintain high-efficiency absorption of mercury is between 100 and 170 ° C, which is lower or higher than this temperature range The adsorption efficiency will be greatly reduced
In response to this situation, some researchers began to study non-carbon-based adsorbents, but the adsorption efficiency achieved was low, and the defect of the narrow temperature range of mercury action could not be solved.

Method used

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  • Coal-fired flue gas mercury removal adsorbing agent and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A mercury-removing adsorbent for coal-fired flue gas of the present invention is mainly obtained by modifying the non-carbon-based carrier chabazite with an active material cupric chloride solution.

[0028] A preparation method of the coal-fired flue gas mercury removal sorbent of the above-mentioned present embodiment, comprising the following steps:

[0029] (1) Put the non-carbon-based carrier chabazite into a passivated container, pour a copper chloride solution with a mass concentration of 5wt% into the container to ensure that the solution can fully infiltrate the chabazite, put it into a magnetic stirrer, and control The rotating speed is 300r / min, vigorously stirred on a magnetic stirrer for 24 hours (at room temperature), and then left to stand to obtain the modified chabazite.

[0030] (2) After taking out the modified chabazite, wash it with demineralized water, and dry the modified chabazite in an oven at 90°C for 12 hours.

[0031] (3) Taking out the drie...

Embodiment 2

[0035] A method for preparing an adsorbent for removing mercury from coal-fired flue gas of the present invention is basically the same as that in Example 1, the only difference being that the mass concentration of the copper chloride solution is 1 wt%.

Embodiment 3

[0037] A method for preparing an adsorbent for removing mercury from coal-fired flue gas of the present invention is basically the same as that in Example 1, the only difference being that the mass concentration of the copper chloride solution is 10 wt%.

[0038] The coal-fired flue gas mercury-removing adsorbent prepared in the present invention can be applied to the treatment of mercury pollutants in coal-fired boiler flue gas. like figure 1 Shown is the variation curve of the mercury removal efficiency of the adsorbents prepared under different mass concentrations of copper chloride solutions in Examples 1 to 3 as a function of temperature. Wide temperature range, strong adsorption capacity, high adsorption efficiency, and the modification effect of copper chloride solution with a mass concentration of 5% is the best. When the temperature is 25°C, the mercury removal efficiency can reach about 95%. When the temperature reaches At 350°C, the mercury removal efficiency can s...

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Abstract

The invention discloses a coal-fired flue gas mercury removal adsorbing agent and a preparation method and application thereof. The coal-fired flue gas mercury removal adsorbing agent is mainly prepared through drying, smashing and calcining after amorphous-carbon-based carrier chabasite is modified with an active substance copper chloride solution. The preparation method includes the steps that the chabasite is modified with the copper chloride solution, and then drying, smashing and calcining are conducted. The coal-fired flue gas mercury removal adsorbing agent is low in cost, wide in applicable temperature range and high in adsorbing capacity and adsorption efficiency, and can be effectively applied to treating coal-fired boiler smoke mercury pollutants.

Description

technical field [0001] The invention belongs to the technical field of boiler combustion pollutant control, and relates to a coal-fired boiler flue gas mercury removal technology, in particular to a coal-fired flue gas mercury-removing adsorbent and its preparation method and application, which are used to solve the problem of mercury in coal-fired boiler flue gas The issue of emission control. Background technique [0002] With the continuous improvement of people's awareness of environmental pollution and the gradual deepening of the country's environmental governance, mercury, as an important source of heavy metal pollution, has also been included in the monitoring schedule. The technologies for controlling the emission of mercury in flue gas of coal-fired boilers are mainly divided into three types: pre-combustion, during-combustion and post-combustion. Post-combustion treatment has become the focus of current research because of its simplicity. Post-combustion treatment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/18B01J20/30B01D53/02
CPCB01J20/186B01D53/02B01D2257/602B01D2258/0283
Inventor 于鹏峰罗光前
Owner STATE GRID CORP OF CHINA
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