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Method for implementing magnesium-ammonia combined flue gas desulfuration and decarbonization and by-product recovery

A technology for realizing methods and by-products, applied in separation methods, chemical instruments and methods, products, etc., can solve problems such as increased desulfurization costs

Inactive Publication Date: 2011-02-16
SHANGHAI JIAO TONG UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The desulfurization process requires continuous replenishment of magnesium-based raw materials (mainly light-burned magnesium oxide powder), which greatly increases the cost of desulfurization

Method used

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  • Method for implementing magnesium-ammonia combined flue gas desulfuration and decarbonization and by-product recovery
  • Method for implementing magnesium-ammonia combined flue gas desulfuration and decarbonization and by-product recovery

Examples

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Embodiment 1

[0034] In the present embodiment, 262.0 g of magnesium sulfate heptahydrate solid (13.47% of magnesium element content) was weighed, dissolved in 1500 ml of water, and 1500 ml of solution containing magnesium sulfate 10% was configured, pH=7. At a temperature of 60°C, 232.0 g of ammonium bicarbonate solid was metered and added five times, and the reaction was carried out under closed stirring at a temperature of 60°C for 3 hours. Separate with a centrifuge to obtain about 280 g of basic magnesium carbonate solid (wet, about 80 g after drying at 120° C.) and 1300 ml of filtrate. The magnesium ion content in the filtrate is detected by the EDTA method (GB / T 15452-95), and it is determined through calculation that 80% of the magnesium ion is converted into basic magnesium carbonate precipitation in the regeneration reaction.

[0035] The present embodiment collects the filtrate 1500ml of above-mentioned reaction as solvent, adds 262.0g magnesium sulfate heptahydrate solid (magnes...

Embodiment 2

[0038]In the present embodiment, 262.0 g of magnesium sulfate heptahydrate solid (13.47% of magnesium element content) was weighed, dissolved in 1500 ml of water, and 1500 ml of solution containing magnesium sulfate 10% was configured, pH=7. At a temperature of 60° C., 0.5 g of polyvinyl alcohol was added, and 232.0 g of ammonium bicarbonate solid was metered in five times, and the reaction was carried out under closed stirring at a temperature of 60° C. for 3 hours. Separate with a centrifuge to obtain about 315 g of basic magnesium carbonate solid (wet, about 90 g after drying at 120° C.) and 1300 ml of filtrate. The content of magnesium ions in the filtrate was detected by the EDTA method (GB / T 15452-95), and it was determined through calculation that 90% of the magnesium ions were converted into basic magnesium carbonate precipitates in the regeneration reaction.

[0039] The present embodiment collects 1500ml of the filtrate of the above reaction as a solvent, adds 262.0g...

Embodiment 3

[0042] In this embodiment, 35Kg of industrial-grade light-burned magnesia (with a magnesia content of 95%) was weighed, and the solution was dissolved in 300 L of water to prepare a slurry containing 10% magnesia. Liquid to gas ratio 2.5L / m 3 , The diameter of the desulfurization tower is 480mm, and the height is 3000mm. The tower is equipped with a double-layer spray system and a single-layer swirl plate. The desulfurization slurry is sprayed down from the top of the tower, contacts with the flue gas in the reverse direction, and reacts in full gas-liquid phase contact on the swirl plate, and the desulfurization slurry absorbs the harmful gas of sulfur dioxide in the flue gas. The removal efficiency of sulfur dioxide in flue gas is 96%.

[0043] In this embodiment, the desulfurized and purified flue gas passes through the demister and is directly discharged into the atmosphere through the chimney, and part of the purified flue gas enters the decarbonization tower through a p...

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Abstract

The invention discloses a method for implementing magnesium-ammonia combined flue gas desulfuration and decarbonization and by-product recovery in the technical field of environment. A method for recycling a desulfurization product of magnesium sulfate through ammonium carbonate / bicarbonate prepared through decarbonization and concentrating ammonium sulfate is utilized, waste liquor subjected to wet magnesium-desulphurization is regenerated on the basis of guaranteeing the desulphurization efficiency, the prepared basic magnesium carbonate solid is used for desulphurization recycling, and simultaneously a by-product of ammonium sulfate solid is prepared. The comprehensive technology for gathering carbon dioxide in the flue gas by using ammonia water so as to produce ammonium carbonate / bicarbonate and treating the magnesium sulfate produced through wet magnesium-desulphurization by using ammonium bicarbonate can simultaneously remove the carbon dioxide in the flue gas and obtain basic magnesium carbonate and ammonium sulfate fertilizers.

Description

technical field [0001] The invention relates to a desulfurization and decarbonization coupling method in the field of environmental technology, in particular to a magnesium-ammonia combined flue gas desulfurization and decarbonization and by-product recovery method. Background technique [0002] my country is the country with the largest annual consumption of coal in the world, and coal combustion is the main energy source in our country. Sulfur dioxide produced by burning coal is very large, causing acid rain pollution. The state has clearly required that industrial and power plant coal-fired boilers must be desulfurized. [0003] There are many methods for desulfurization of coal-fired flue gas. Among them, the limestone wet method is the most commonly used, but this method needs to consume a large amount of limestone and water, and at the same time produces a large amount of by-product calcium sulfate, which is difficult to handle, so it is basically used in coal-fired ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/62C05C3/00B01D53/50C01F5/24C01C1/24
CPCY02C10/04Y02C20/40Y02P20/151
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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