Bromine chloride mercury-removing compositional liquor and method for removing mercury in flue gas using the same

A technology of bromine chloride and liquid preparation, which is applied in chemical instruments and methods, separation methods, and separation of dispersed particles, can solve the problems of waste of raw materials, secondary pollution, low oxidation activity, etc., and achieve the goal of reducing operating costs and saving bromine The effect of dosage

Inactive Publication Date: 2009-04-15
上海交通大学中原研究院
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Problems solved by technology

Patents JP2000325747 and US2008107579 respectively propose a method to improve the conversion of zero-valent mercury in flue gas by adding salts such as chlorides to coal, but this method will accelerate the corrosion of the boiler furnace and heat exchange surfaces; the patent CA2418578 directly sprays halides and other salts into the hot flue gas to enhance the conversion of zero-valent mercury, but the oxidation activity of these substances is low, and they must be used in combination with other adsorbents to achieve better results; however, the above process The chlorine-containing or bromine-containing salts used have weak oxidation activity to zero-valent mercury, which leads to an increase in the dosage of chlorine or bromine, which not only causes waste of raw materials, but also may cause secondary pollution
In addition, the effect of bromine or its compounds is better than that of chlorine or chloride, but its cost is higher, so its usage should be saved as much as possible

Method used

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Examples

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Effect test

preparation example Construction

[0039]In the preparation process of the compound solution, the bromine-containing substances mainly used are elemental bromine, soluble bromine salts, such as sodium bromide, etc.; when bromine salt solution is used to prepare bromine chloride, ferric chloride is used as the liquid phase catalyst ; Utilize chlorine gas as the raw material for preparing bromine chloride, and ammonium chloride is one of the stable components as the compound liquid; in the compound liquid, bromine chloride: ammonia: organic acid ammonium: ammonium halide: the weight ratio of water is 0.5~15: 2-10: 3-15: 2.5-8: 50-90.

[0040] Dilute the above-mentioned compound liquid with 0-5% dilute ammonia water by 1 to 1000 times, and inject it into the flowing high-temperature flue gas by spraying, and the injection amount is based on the atoms of bromine and zero-valent mercury in the flue gas. The ratio is 10~10000:1 to add;

[0041] In order to ensure that the compound liquid is fully vaporized and decom...

Embodiment 1

[0045] Preparation of compound solution: get 20g of elemental bromine (analytically pure, >98%) and put it into a 75ml gas absorption bottle; prepare bromine chloride reserve buffer 100ml, wherein ammonium chloride content is 5%, ammonium oxalate 10% %, 10% free ammonia water, and put the buffer solution in a 250mL gas absorption bottle; connect the gas outlet of the gas absorption bottle containing bromine with the gas inlet of the absorption bottle containing buffer solution; Continuous bubbling of chlorine gas with a content of 20% into the absorption bottle containing bromine at a constant rate, and the bromine chloride produced is absorbed by the downstream buffer solution. When the elemental bromine in the bromine bottle was reduced by 10g, the chlorine flow was stopped. At this point, the bromine content in the downstream buffer was about 8.5%, mainly in the form of bromine chloride. In this way, the stock solution of the compound solution is made, wherein the content ...

Embodiment 2

[0050] The preparation method of compound solution: main preparation condition is similar to embodiment 1, just utilizes 100mL 15% sodium bromide and 5% FeCl The mixed solution replaces elemental bromine, to prepare bromine chloride.

[0051] A quartz tube with a diameter of 20mm and a length of 500mm is used as a reactor, with a 200mm water jacket cooling device downstream, and a tubular heating furnace is used for heating. Use simulated flue gas prepared on site ([NO]=350ppm, [Hg 0 ] = 200μg / m 3 The rest is air), the airflow of 800ml / min passes through the reactor continuously, and passes through the total mercury, Hg in the reactor outlet gas 0 , NO concentration to determine the effect. The difference from Example 1 is that 2 g of catalyst pellets (alumina containing 1% Mn) with a diameter of 1 mm were loaded into the quartz reactor.

[0052] The simulated flue gas was treated according to the conditions of Example 1. The results show that when the reaction reaches a s...

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Abstract

The invention relates to a bromine chloride mercury-removal compound liquid and a method for flue gas mercury-removal in the technical field of environmental protection. The compound liquid comprises the following components in weight percentage: 0.5 to 15 percentage of bromine chloride, 2 to 10 percentage of ammonia, 3 to 15 percentage of organic acid ammonium, 2.5 to 8 percentage of ammonium halide and 50 to 90 percentage of water. The method comprises the following steps: diluting the bromine chloride mercury-removal compound liquid by 1 to 1,000 times by ammonia; pouring the compound liquid dilution into flue gas, wherein the stoichiometric ratio of bromine to null-valence mercury in the flue gas is 10-10,000 to 1; oxidizing the null-valence mercury to be bivalent mercury by the compound liquid poured into the flue gas; at the same time, reducing part of nitrogen oxide; treating the flue gas by a desulfurizing device; absorbing and purifying the bivalent mercury and sulfur dioxide in the flue gas; and removing the trace bromine chloride and ammonia remained in the flue gas. The null-valence mercury, part of the nitrogen oxide and sulfur dioxide can be removed simultaneously by the method.

Description

technical field [0001] The invention relates to a control technology for mercury emission in coal-fired flue gas in the technical field of environmental protection, in particular to a mercury-removing bromine compound solution and a method for removing mercury from flue gas using it. Background technique [0002] Mercury is highly toxic. Although its concentration in coal combustion flue gas is low, its harm in the environment is quite serious. Due to the generally high mercury content in my country's coal combustion, and its huge coal consumption, my country has become one of the countries with the most serious mercury pollution in the world. Although my country has begun to pay attention to the control of coal-burning mercury pollution, since the pollution of sulfur dioxide and nitrogen oxides in my country has not been effectively alleviated, it is impossible to greatly increase the equipment investment and operating costs of flue gas purification for mercury removal alon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/64B01D53/78
Inventor 晏乃强迟遥瞿赞郭永福王京
Owner 上海交通大学中原研究院
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