Method for removing mercury in flue gas by use of waste desulfurizer after being used for recycling elemental sulfur

A technology of waste desulfurizer and desulfurizer, which is applied in separation methods, chemical instruments and methods, dispersion particle separation, etc. Increase, improve adsorption effect, enhance the effect of reactivity

Active Publication Date: 2015-02-11
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problems that a large amount of high-priced mercury removal agents are needed in the existing mercury pollution control process, and the waste iron oxide-based desulfurizers are difficult to handle and apply, and can also significantly improve the adsorption effect on zero-valent mercury in mercury-containing flue gas

Method used

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  • Method for removing mercury in flue gas by use of waste desulfurizer after being used for recycling elemental sulfur
  • Method for removing mercury in flue gas by use of waste desulfurizer after being used for recycling elemental sulfur
  • Method for removing mercury in flue gas by use of waste desulfurizer after being used for recycling elemental sulfur

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The waste iron oxide-based desulfurizer replaced by a chemical plant was used for testing. The carbon and sulfur analyzer determined that the total sulfur content in the spent iron oxide desulfurizer was about 21wt%, and the elemental sulfur content was about 7wt%. The waste iron oxide-based desulfurizer was dried in an electric blast drying oven for 4 hours, and the temperature was set at 120°C. Then take out the dried waste desulfurizer and pulverize it to 40-60 mesh, then weigh 2g, put it into the center of a quartz tube with a diameter of 8.6mm and a length of 642mm, and plug both ends of the desulfurizer with quartz wool to fix it. The quartz tube was placed in a tube furnace for heating at 290 °C. The inlet of the quartz tube is fed into N 2 , the gas flow rate is controlled at 300ml / min, and the outlet is connected to a set of gas cooling device to recover steam sulfur. The whole waste desulfurizer heat treatment process time is controlled at about 8 minutes. ...

Embodiment 2

[0036] Another waste iron oxide-based desulfurizer was used for testing. The measurement shows that the total sulfur content in the waste desulfurizer is about 17wt%, and the sulfur content is about 6wt%. The above waste iron oxide-based desulfurizer was placed in an electric blast drying oven for 3 hours, and the temperature was set at 120°C. Then take out the dried waste desulfurizer and pulverize it to 40-60 mesh, then weigh 2g, put it into the center of a quartz tube with a diameter of 8.6mm and a length of 642mm, and plug both ends of the desulfurizer with quartz wool to fix it. The quartz tube was heated in a tube atmosphere furnace at a temperature of 380 °C. The inlet of the quartz tube is fed into CO 2 , the gas flow rate is controlled at 300ml / min, and the outlet is connected to a set of gas cooling device to recover steam sulfur. The whole waste desulfurizer heat treatment process time is controlled at about 1.5min. After the heat treatment, the waste desulfuriz...

Embodiment 3

[0040] The waste desulfurization agent with a sulfur content of 1.3 wt% after heat treatment in Example 1 was used as a flue gas mercury removal agent to conduct direct injection type mercury removal activity evaluation. The experiment was carried out in a simulated flue gas pipeline. A quartz tube with an inner diameter of 20mm and a length of 600mm was placed vertically, and the temperature was kept at 80°C by electric heating. Inject simulated mercury-containing flue gas, the composition of simulated mercury-containing flue gas is 40μg / m 3 Hg, 12v / v%CO 2 , 6v / v%O 2 , 1500ppmSO 2 , 500ppmNO, 10ppmHCl and 1v / v%H 2 O, the balance is balance gas N 2 ; Keep the mercury-containing flue gas flow flowing through the quartz tube from top to bottom, and the average flow rate of the mercury-containing flue gas flow is 6m 3 / h, a small cyclone dust collector is installed at the gas outlet of the quartz tube. Spray the waste desulfurizer with a sulfur content of 1.3wt% after heat ...

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Abstract

The invention provides a method for removing mercury in flue gas by use of a waste desulfurizer after being used for recycling elemental sulfur, and relates to an environment-friendly treatment method in which a heat-treated waste ferric oxide desulfurizer is used as a coal-fired flue gas mercury remover. According to the method comprises, rich elemental sulfur in the waste desulfurizer is recycled by use of carrier gas under a heating condition, wherein based on the total amount of the waste desulfurizer, the content of the total sulfur in the waste ferric oxide desulfurizer in 17wt%-21wt%, and the content of the elemental sulfur in the waste ferric oxide desulfurizer is 6wt%-7wt%; the condition that pores of the desulfurizer are blocked by the elemental sulfur is improved. The content of the elemental sulfur in the heat-treated waste desulfurizer is 1-2wt%; the heat-treated waste ferric oxide desulfurizer has the excellent activity to zero-valence mercury, and is capable of finally converting adsorbed mercury into stabilized mercury sulfide. The method for removing the mercury in the flue gas by use of the waste desulfurizer after being used for recycling the elemental sulfur is used for solving the problem of recycling the waste desulfurizer; as a result, a sulfur product can be obtained, and furthermore, an efficient and cheap waste gas mercury remover is found out, and the environment protection treatment cost can be reduced.

Description

technical field [0001] The invention relates to an environmentally friendly treatment method and application direction of using waste desulfurizer after heat treatment as a mercury removal agent for coal-fired flue gas, and specifically relates to a method for removing mercury in flue gas by using waste desulfurizer after recovering elemental sulfur. Mercury method. Background technique [0002] Mercury is a toxic substance that accumulates permanently in organisms and in the food chain. It usually takes several years or more than ten years for the cumulative toxicity of mercury to become a serious threat to the health of the population. At the same time, mercury is highly toxic and stays in the atmosphere for a long time, and its harm to the environment cannot be ignored. [0003] Mercury enters the environment mainly through natural and anthropogenic emissions. Natural emissions mainly refer to volcanic eruptions, etc. Man-made emissions accounted for a large proportion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/83B01D53/64
Inventor 王建成韩丽娜常丽萍孟华王辉苗茂谦鲍卫仁
Owner TAIYUAN UNIV OF TECH
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