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Flue gas mercury absorption liquid with functions of oxidizing and fixing synchronously

A technology for mercury absorption and coal-fired flue gas, which is applied in chemical instruments and methods, dispersed particle separation, separation methods, etc., can solve the problems of large consumption of oxidant, unsatisfactory reduction inhibition effect, increased absorption liquid corrosion, etc., to achieve mercury The effect of high removal rate

Active Publication Date: 2012-06-27
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 invention patent application with the publication number CN1962034 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 on the device, and although mercury is partially complexed in the absorption liquid, However, the reduction inhibition effect is not ideal, and the total mercury removal efficiency is not high
The invention patent application with the publication number CN101157003 discloses a combined desulfurization and mercury removal process and system using an ammonia desulfurization system for gas-phase oxidation and liquid-phase absorption. The use of chlorine gas as an oxidant will increase the corrosion resistance requirements for equipment, and at the same time, the liquid-phase mercury The fixation of mercury is not combined with the absorption tower, which is not conducive to the fixation of mercury in the absorption process, and the phenomenon of reduction is still not solved
The invention patent application with the publication number CN101310834 discloses a multi-stage joint desulfurization, demercuration and denitrification process based on the limestone-gypsum method. Mercury is not fixed after being oxidized and absorbed in the secondary reactor, but exists in the slurry in an ion state, causing Secondary pollution and re-release issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: Fenton's reagent oxidation combined with lime slurry + sodium thiosulfate to absorb and remove mercury

[0041] The mercury removal absorption liquid used in this embodiment includes lime slurry with a mass concentration of 4%, and Fenton's reagent and sodium thiosulfate, Fe 3+ From Ferric Chloride, Fe 3+ :H 2 o 2 =0.5, the pH value of the absorption solution is 3.5, and the addition amount of Fenton’s reagent is expressed as H 2 o 2 Calculated as 0.09mol / L, the amount of sodium thiosulfate added is 0.8mol / L; under simulated conditions, the imported mercury concentration is 60μg / L, the sulfur dioxide concentration is 500ppm, and the gas volume is 2L / min, the height of the absorption liquid is 14cm, and the volume of the absorption liquid is 300ml. The removal rate of sulfur dioxide is greater than 25%, and the removal efficiency of mercury reaches 50%.

Embodiment 2

[0042] Example 2: Fenton reagent oxidation combined with limestone slurry + calcium thiosulfate to absorb and remove mercury

[0043] The mercury removal absorbing solution used in this embodiment includes limestone slurry with a mass concentration of 4%, and Fenton's reagent and sodium thiosulfate, Fe 3+ From Ferric Chloride, Fe 3+ :H 2 o 2 =0.6, the pH value of the absorption solution is 1.5, and the addition amount of Fenton's reagent is expressed as H 2 o 2 Calculated as 0.07mol / L, the amount of sodium thiosulfate added is 0.6mol / L; under simulated conditions, the imported mercury concentration is 60μg / L, absorbed by the bubble bottle, the gas volume is 2L / min, and the absorption liquid height is 14cm , the volume of the absorption liquid is 300ml, the temperature of the absorption liquid is 30°C; the removal rate of sulfur dioxide is greater than 20%, and the removal efficiency of mercury reaches 60%.

Embodiment 3

[0044] Example 3: Fenton reagent oxidation combined with calcium oxide + potassium thiosulfate to absorb and remove mercury

[0045] The mercury removal absorbing solution used in this embodiment includes a calcium oxide (calcium hydroxide after entering the solution) slurry with a mass concentration of 3%, and in the slurry, Fenton's reagent and potassium thiosulfate, Fe 3+ From ferric nitrate, Fe 3+ :H 2 o 2 =0.7, the pH value of the absorption solution is 1.5, and the addition amount of Fenton’s reagent is expressed as H 2 o 2 Calculated as 0.15mol / L, the amount of potassium thiosulfate added is 0.9mol / L; under simulated conditions, the imported mercury concentration is 60μg / L, the sulfur dioxide concentration is 500ppm, and the gas volume is 2L / min, the height of the absorption liquid is 14cm, the volume of the absorption liquid is 300ml, and the temperature of the absorption liquid is 45°C; the removal rate of sulfur dioxide is greater than 35%, and the removal effic...

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Abstract

The invention discloses flue gas mercury absorption liquid with functions of oxidizing and fixing, which consists of calcium-based desulphurization slurry, Fenton reagent and soluble thiosulfate. The Fenton reagent is used as oxidant to oxidize zero-state mercury, and the thiosulfate is used as a stabilizing agent to precipitate and stabilize the absorbed mercury. The precipitated mercury and thegenerated gypsum are precipitated together to form a solid phase, a part of the absorbed sulfur dioxide is absorbed into a liquid phase and oxidized into gypsum under the action of redundant oxidant,the absorption liquid separates the gypsum from the liquid phase through solid-liquid separation modes such as precipitation and the like, and the mercury is separated and removed at the same time. The mercury absorption liquid of the invention can be used for flue gas purification, and has the capacities of mercury oxidation absorption and liquid phase stabilization.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a mercury absorbing liquid with oxidation absorption and harmless treatment. Background technique [0002] Mercury is a three-caused "carcinogenic, teratogenic, and mutagenic substance", which can accumulate in the human body and cause damage to the human body's nerves. In August 2000, the Canadian National Research Council (NRC) conducted a detailed investigation and research and concluded that the 0.1ug / Kg.d proposed by the US Environmental Protection Agency (EPA) is the minimum exposure that will not cause neurological damage to fetuses or infants. value. Studies have shown that the burning of coal is a source of mercury pollution. my country is rich in coal resources and cheap, and is the world's largest coal producer and consumer. It is expected that my country's coal-based energy structure will not undergo significant changes in the next 50 years. Moreover,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/64B01D53/80
Inventor 刘越吴忠标王岳军莫建松王海强
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH