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Calcium-magnesium combined desulphurization and denitrification method realizing deep removal of flue gas pollutants

A technology for desulfurization, denitrification, and deep desulfurization, which is applied in separation methods, chemical instruments and methods, and gas treatment, and can solve the problems of calcium desulfurization that is difficult to meet the requirements of ultra-low emissions, high cost, and difficult to apply to large-scale desulfurization. Achieve the effect of not easy to corrode, improve desulfurization efficiency and reduce maintenance cost

Active Publication Date: 2016-04-20
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0005] To sum up, calcium desulfurization is difficult to meet the current ultra-low emission requirements, while magnesium desulfurization is difficult to apply to large-scale desulfurization, and the cost is high

Method used

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  • Calcium-magnesium combined desulphurization and denitrification method realizing deep removal of flue gas pollutants

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Effect test

Embodiment 1

[0030] Such as figure 1 As shown, this embodiment adopts integrated equipment, which are tower kettle area 5, main desulfurization area 1, deep desulfurization area 2 and dust and mist removal area 3 from bottom to top. The solution in the deep desulfurization zone 2 is passed into the desulfurization liquid circulation pool 4, and ammonia water is added to obtain magnesium hydroxide for recycling. The specific steps are as follows:

[0031] (1) The concentration of sulfur dioxide in raw flue gas is 500mg / m 3 , the concentration of nitrogen oxides is 150mg / m 3 , of which nitric oxide 80mg / m 3 , nitrogen dioxide 70mg / m 3 , the flue gas temperature is 180°C; the raw flue gas is 3 The flow rate of / h is discharged into the main desulfurization zone 1; the main desulfurization zone adds a desulfurizer solution with a flow rate of 300L / h, which is prepared by dissolving lime in water, its concentration is 20wt%, and its pH is 6.5. After that, low-sulfur flue gas is obtained, a...

Embodiment 2

[0038] This embodiment adopts integrated equipment, which are dust and mist removal area, deep desulfurization area, main desulfurization area, and tower kettle area from top to bottom. The solution in the deep desulfurization area is passed into the desulfurization liquid circulation pool, and ammonia water is added to obtain magnesium hydroxide for recycling. The specific steps are as follows:

[0039](1) The concentration of sulfur dioxide in raw flue gas is 5000mg / m 3 , the concentration of nitrogen oxides is 450mg / m 3 , of which nitric oxide 250mg / m3, nitrogen dioxide 200mg / m3 3 , the flue gas temperature is 180°C; the raw flue gas is 3 The flow rate of / h is discharged into the main desulfurization area; the main desulfurization area adds a desulfurizer solution with a flow rate of 800L / h, which is prepared by dissolving lime in water, its concentration is 5wt%, and its pH is 5.5. After the reaction , to obtain low-sulfur flue gas, after the reaction, to obtain low-su...

Embodiment 3

[0046] Field test 1: Take the actual flue gas of a coal-fired power plant as the treatment object, and lead it out from the flue for 100m 3 / h of actual flue gas, in which the concentration of sulfur dioxide is 800mg / m 3 , the concentration of nitric oxide is 200mg / m 3 , the concentration of nitrogen dioxide is 180mg / m 3 (ozone injection). Limestone powder is used as the desulfurizer in the main desulfurization area, the solution concentration is about 10%, and the desulfurization liquid-gas ratio is 5L / m 3 , the desulfurization agent in the deep desulfurization area is magnesium oxide, the pH value of the desulfurization liquid is controlled at 7, the concentration of the slurry is 2%, and the desulfurization liquid-gas ratio is 2L / m 3 , and add 1% hydrogen peroxide in the deep desulfurization zone. Using the same steps as in Example (1), desulfurization and denitrification treatment was performed on raw flue gas. Through testing and analysis, it can be concluded that th...

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Abstract

The invention discloses a calcium-magnesium combined desulphurization and denitrification method realizing deep removal of flue gas pollutants, and relates to the field of environmental protection, in particular to a novel technology developed for deep desulphurization and denitrification of industrial flue gas. Desulphurization equipment corresponding to the method comprises multiple areas including a main desulphurization area, a deep desulphurization area and an efficient dedusting and demisting area. In the main desulphurization area, a conventional calcium process (lime or limestone) is used for desulphurization, and higher than 90% of the flue gas desulphurization efficiency is realized under more economical and reasonable conditions; then the flue gas passes through the deep desulphurization area, a magnesium-process desulphurization technology is used, concentration of sulfur dioxide in the flue gas is reduced to be lower than 30 mg / m<3> through desulphurization under the condition of lower liquid-gas ratio, and the requirement for ultralow sulfur dioxide emission is met. Besides, an oxidation denitrification accelerant can be added to the deep desulphurization area, and desulphurization and denitrification functions are realized synchronously. Compared with the prior art, the method has the advantages that the desulphurization efficiency is high, the cost is low, and an intermediate product can be recycled.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a calcium-magnesium combined desulfurization and denitrification method that satisfies the deep removal of flue gas pollutants. Background technique [0002] At present, the air pollution situation in our country is severe, which has caused serious harm to human health. SO2 is one of the main pollutants that cause air pollution. Effective control of SO2 in industrial flue gas is an urgent environmental protection issue. In recent years, domestic and foreign industrial waste gas, especially air pollutants from coal-fired power plants have put forward ultra-low emission requirements, requiring SO2 emission to be less than 35mg / m3. [0003] Looking at the mainstream technologies currently used, it can be found that whether it is desulfurization in the furnace or flue gas purification, the core is the reaction of calcium-based compounds with SO2 to form gypsum (CaSO4). These...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/50B01D53/56B01D53/96
CPCB01D53/502B01D53/56B01D53/80B01D53/96B01D2251/402B01D2251/404B01D2258/0283B01D2259/126
Inventor 晏乃强瞿赞赵松建黄文君徐浩淼
Owner SHANGHAI JIAO TONG UNIV
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