Method for realizing integrated desulfurization and denitrification and product recovery based on magnesium-ammonium method

A technology for desulfurization, denitrification and realization method, applied in the environmental field, can solve problems such as difficulty in calcium nitrate salt, secondary pollution, interference with normal circulation and regeneration of sodium-calcium double-alkali method, etc., and achieve the effect of high-efficiency resource utilization and no secondary pollution.

Active Publication Date: 2011-04-13
SHANGHAI JIAO TONG UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, judging from the current operation of related projects at home and abroad, the usual problems of ammonia desulfurization technology are: the ammonia in the desulfurization solution is easy to volatilize into the flue gas, resulting in the escape loss of ammonia, and the ammonia gas that escapes into the flue gas It is also easy to interact with the residual sulfur dioxide in the flue gas to form ammonium salt aerosol particles that are difficult to capture in the flue gas, resulting in scarring of downstream pipelines and new secondary pollution
These problems greatly limit the practical promotion of direct ammonia desulfurization technology
[0003] In addition, the technical demand for flue gas denitrification of coal-fired boilers in my country is also increasing. The conventional SCR flue gas denitrification technology has high catalyst prices, limited life, and consumes a large amount of ammonia (or urea), resulting in high denitrification costs.
At present, the simultaneous desulfurization and denitrification technology using

Method used

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  • Method for realizing integrated desulfurization and denitrification and product recovery based on magnesium-ammonium method
  • Method for realizing integrated desulfurization and denitrification and product recovery based on magnesium-ammonium method

Examples

Experimental program
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Effect test

Example Embodiment

[0023] Example 1

[0024] In this embodiment, 15Kg of light-burned magnesia powder is weighed, dissolved in 300L of water, fully stirred, and configured into a desulfurization slurry with a content of about 5%, and driven into a desulfurization tower for circulating desulfurization. Liquid-gas ratio 2L / m 3 , The desulfurization tower has a diameter of 480mm and a height of 3000mm. The tower is equipped with a double two-layer spray system and a single-layer swirl plate. The desulfurization slurry is sprayed from the top of the tower, contacts the flue gas in the reverse direction, and reacts in full gas-liquid contact on the cyclone plate, and the desulfurization slurry absorbs the harmful sulfur dioxide gas in the flue gas. The desulfurization efficiency is 95.6% and the denitration efficiency is 21.1%.

[0025] The flue gas after desulfurization and purification in this embodiment passes through the demister and is directly discharged into the atmosphere through the chimney.

[0...

Example Embodiment

[0028] Example 2

[0029] In this embodiment, an ozone generator is used at the flue gas inlet, and after calculation, ozone gas with a concentration of 50 ppm is added.

[0030] In this embodiment, 30Kg of light-burned magnesia powder is weighed, dissolved in 300L of water, 1.5Kg of urea is added, and fully stirred to prepare a desulfurization slurry with a content of about 10%, and then added to the desulfurization tower for circulating desulfurization. Liquid-gas ratio 2.5L / m 3 , The desulfurization tower has a diameter of 480mm and a height of 3000mm. The tower is equipped with a double two-layer spray system and a single-layer swirl plate. The desulfurization slurry is sprayed from the top of the tower, contacts the flue gas in the reverse direction, and reacts in full gas-liquid contact on the swirl plate, and the desulfurization slurry absorbs the harmful sulfur dioxide gas in the flue gas. The desulfurization efficiency is 95.1%, and the denitration efficiency is 65.3%.

[...

Example Embodiment

[0034] Example 3

[0035] In this embodiment, a chlorine dioxide generator is used at the flue gas inlet, and after calculation, chlorine dioxide with a concentration of 10 ppm is added.

[0036] In this example, weigh 30Kg of light-burned magnesium oxide powder, dissolve it in 300L of ammonium sulfate solution and water remaining in the last reaction, add 3Kg of urea, stir well, and configure it into a desulfurization slurry with a content of about 10%, add it to the desulfurization Tower, used for circulating desulfurization. Liquid-gas ratio 3L / m 3 , The desulfurization tower has a diameter of 480mm and a height of 3000mm. The tower is equipped with a double two-layer spray system and a single-layer swirl plate. The desulfurization slurry is sprayed from the top of the tower, contacts the flue gas in the reverse direction, and reacts in full gas-liquid contact on the swirl plate, and the desulfurization slurry absorbs the harmful sulfur dioxide gas in the flue gas. The desulfu...

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Abstract

The invention relates to a method for realizing integrated desulfurization and denitrification and product recovery based on the magnesium-ammonium method in the technical field of environment. The method comprises the following steps: firstly adding an oxidant into smoke gas, using magnesium oxide serous fluid containing urea for simultaneously integrated desulfurization and denitrification, andtransforming sulfur dioxide in the smoke gas to magnesium sulfite and magnesium sulfate; and transforming nitrogen oxide to nitrate or nitrogen; and reacting desulfurization waste liquid with ammoniabicarbonate solution after full aeration and oxidation to obtain mixed solution of basic magnesium carbonate precipitate, ammonium sulfate and ammonium nitrate after centrifugation, wherein the basicmagnesium carbonate is used for circulating desulfurization or can be used as an industrial grade product after drying; ammonium sulfate solids containing a small quantity of ammonium nitrate can be obtained after concentrating and crystallizing the centrifuged solution, and the ammonium sulfate solids can be used as fertilizer; and dilute mother liquor is used for preparing magnesium oxide desulfurization serous fluid and can be recycled. By adopting the method, the ammonium sulfate solid fertilizer containing the small quantity of the ammonium nitrate and the industrial grade basic magnesium carbonate can be simultaneously obtained under the premise of ensuring the integrated desulfurization and denitrification efficiency of the smoke gas.

Description

technical field [0001] The invention relates to a method in the field of environmental technology, in particular to a method for realizing comprehensive desulfurization and denitrification and product recovery based on magnesium-ammonium method. Background technique [0002] Magnesium desulfurization technology is a promising wet desulfurization technology, which has the advantages of high desulfurization efficiency, not easy to scale, compact equipment, and low corrosion of desulfurization liquid to equipment. Therefore, this method has received extensive attention in recent years. However, the existing problems of this method are mainly that the high-temperature regeneration method of the desulfurizer is relatively complicated and the regeneration process consumes a lot of energy. If the by-product is recovered as magnesium sulfate, there is a problem of the sale of the by-product, and the desulfurization process needs to be continuously replenished with new magnesium-bas...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/60C05C13/00C01F5/24
CPCY02A50/20
Inventor 晏乃强瞿赞李钢建张来友莫建松吴忠标
Owner SHANGHAI JIAO TONG UNIV
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