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Mercury removal process based on lime-gypsum method desulphurization system and mercury removal absorption liquid

A desulfurization system and mercury absorption technology, applied in separation methods, chemical instruments and methods, and dispersed particle separation, can solve the problems of mercury reduction not being effectively suppressed, increased absorption liquid corrosion, and failure to achieve stabilization, etc. High removal rate, suppression of mercury reduction, and high mercury removal effect

Active Publication Date: 2009-12-02
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it adopts the method of direct injection, the absorbed mercury is still free in the absorption liquid, the reduction of mercury is not effectively suppressed, and the consumption of oxidant is relatively large
The publication number is CN19620234, which discloses a method of oxidative absorption and demercuration using chlorine-containing oxides, but the addition of chloride ions will increase the corrosion of the absorption liquid to the device, and although mercury is partially complexed in the absorption liquid, it has not been realized. Really stabilized, there is still a certain reduction

Method used

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  • Mercury removal process based on lime-gypsum method desulphurization system and mercury removal absorption liquid

Examples

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Comparison scheme
Effect test

Embodiment 1

[0046] Example 1: Ammonium persulfate oxidation combined with calcium hydroxide absorption to remove mercury

[0047] The flue gas mercury removal absorption liquid used in this embodiment includes calcium hydroxide slurry with a mass concentration of 2%. Ammonium persulfate is added to the calcium hydroxide slurry in an amount of 5 mmol / L. Under simulated flue gas conditions , the mercury inlet concentration is 80μg / L, the sulfur dioxide concentration is 1500ppm, and the nitrogen oxide concentration is 300ppm. Through single-layer spraying, the removal efficiency of sulfur dioxide is above 60%, the removal efficiency of nitrogen oxide is above 20%, and the removal efficiency of mercury reaches 50%.

Embodiment 2

[0048] Example 2: Ammonium persulfate oxidation combined with calcium sulfite absorption to remove mercury

[0049] The flue gas mercury removal absorption liquid used in this embodiment includes calcium sulfite slurry with a mass concentration of 5%. Ammonium persulfate is added to the calcium sulfite slurry in an amount of 8mmol / L. Under simulated flue gas conditions , the mercury inlet concentration is 80μg / L, the sulfur dioxide concentration is 1500ppm, and the nitrogen oxide concentration is 300ppm. Through single-layer spraying, the removal efficiency of sulfur dioxide is above 60%, the removal efficiency of nitrogen oxide is above 20%, and the removal efficiency of mercury reaches 53%.

Embodiment 3

[0050] Example 3: Sodium persulfate and ammonium sulfate oxidation combined with calcium hydroxide absorption to remove mercury

[0051] The flue gas mercury removal absorbing liquid used in this embodiment comprises calcium hydroxide slurry with a mass concentration of 2%, sodium persulfate and ammonium sulfate are added to the calcium hydroxide slurry, and its addition is sodium persulfate 5mmol / L, Ammonium sulfate is 8mmol / L. Under simulated flue gas conditions, the mercury inlet concentration is 80μg / L, the sulfur dioxide concentration is 1500ppm, and the nitrogen oxide concentration is 300ppm. The oxide removal efficiency is above 30%, and the mercury removal efficiency reaches 55%.

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Abstract

The invention discloses mercury removal absorption liquid based on a lime-gypsum method desulphurization system. Main components of the mercury removal absorption liquid comprise desulphurization slurry and oxidant; the desulphurization slurry is at least one of calcium hydroxide solution and calcium sulfite solution, and the mass concentration of the desulphurization slurry is 1 to 30 percent; and the oxidant is soluble salt or mixture of soluble salt of which positive ions contain ammonium radical and negative ions contain peroxosulfuric acid radical or peroxosulfuric acid hydrogen radical. Moreover, a soluble transition metal salt as an oxidation catalyst can be added into the mercury removal absorption liquid to increase the removal efficiency of mercury. The invention also discloses a specific mercury removal process using the mercury removal absorption liquid; and the process has the characteristics of high mercury removal effect, little byproduct and low transformation cost, does not introduce other corrosive ions, does not influence the quality of gypsum, and can promote the system to absorb sulfur dioxide and nitric oxide to a certain extent.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a mercury removal process based on a lime-gypsum desulfurization system and a mercury removal absorption liquid. Background technique [0002] Recent studies have shown that anthropogenic mercury pollution mainly comes from fossil fuel combustion, waste combustion, and metallurgy, cement manufacturing, and other mercury-using projects. my country is rich in coal resources and cheap. It is the largest coal producer and consumer in the world, and one of the few countries in the world where coal is the main energy source. It is estimated that in the next 50 years, my country's energy structure dominated by coal will not Significant changes occur. Moreover, the mercury content in coal in my country is higher than that in other countries, and there is a serious problem of mercury pollution. [0003] At present, mercury control in foreign countries basically adopts activ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/60B01D53/64
CPCY02A50/20
Inventor 吴忠标王岳军刘越莫建松王海强
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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