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Method for using magnesium compound and ammonia to circulate regeneration flue gas desulfurization

A technology of magnesium compound and regenerated flue gas, applied in chemical instruments and methods, separation methods, separation of dispersed particles, etc., to achieve full utilization and reduce desulfurization costs

Inactive Publication Date: 2007-10-17
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to address the deficiencies of the prior art, to provide a method for regenerating flue gas desulfurization using magnesium compounds and ammonia, which can effectively realize flue gas desulfurization and purification, wherein the desulfurizer can be recycled and reused, reducing the cost of desulfurization, while not There is a secondary pollution problem

Method used

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  • Method for using magnesium compound and ammonia to circulate regeneration flue gas desulfurization

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Take 10kg of 200 mesh magnesium oxide powder and place it in the slurry tank, add 200L of water, and stir to prepare a magnesium hydroxide slurry with a solid content of about 6%; take 100L of the above slurry and place it in the circulating tank as a desulfurization solution. In order to prevent the precipitation of magnesium hydroxide, the slurry is continuously stirred with a mixer. A slurry pump is used to transport the desulfurization circulating liquid to the top of the desulfurization tower at a flow rate of 300L / h, and a large-aperture nozzle is used to disperse the liquid into droplets. The desulfurization tower uses an empty tower with a diameter of 200m and a height of 2000mm. The simulated flue gas enters from the bottom of the desulfurization tower and contacts the desulfurization droplets sprayed from the top of the tower in the reverse direction during the ascent. The flow of simulated flue gas is 150m 3 / h, the initial concentration of sulfur dioxide in the ...

Embodiment 2

[0047] Take 20kg of 200-300 mesh magnesium hydroxide powder, add 200L of water to the slurry tank, and stir with a stirrer to make a magnesium hydroxide slurry with a content of about 10%; take 100L of the above slurry and place it in the circulating tank as the desulfurization liquid . A slurry pump is used to transport the desulfurization circulating liquid to the blind plate of the absorption plate of the cyclone plate desulfurization tower at a flow rate of 200L / h. The diameter of the swirl plate tower is still 200m, the height is 2000mm, and two absorption plates and one demister plate are installed inside. The simulated flue gas enters from the bottom of the desulfurization tower, passes through the swirl plate for gas-liquid contact mass transfer, and absorbs sulfur dioxide in the flue gas. The flow of simulated flue gas is 200m 3 / h, the initial concentration of sulfur dioxide in the flue gas is 2000ppm, and the liquid-to-gas ratio is 1L / m 3 . When the flue gas flows out f...

Embodiment 3

[0051] The pulping and sulfur dioxide absorption conditions are the same as in Example 1, but solid ammonium bicarbonate is used instead of ammonia during regeneration. By adding ammonium bicarbonate to the oxidized desulfurization solution, the pH value is adjusted to about 7.5, so that the magnesium sulfate in the desulfurization solution is precipitated in the form of magnesium carbonate. After solid-liquid separation, the solid magnesium carbonate is returned to the pulping tank for recycling. The ammonium sulfate solution is sent to the mother liquor concentration tank, and the ammonium sulfate fertilizer is obtained through processes such as concentration, cooling and crystallization.

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Abstract

The invention relates to a cyclic regeneration flue gas desulfurization method using magnesium compounds and ammonia. Firstly, the magnesium compounds and ammonia which is used as desulfurizer is made to be seriflux after mixed with water, and then is send to recycling tank and then to the thionizer using seriflux pump to absorb the sulfur dioxide therein via the contact with flue gas to get the purpose of desulfurization purification of the flue gas. Part of the desulfurization solution is drawn off and regenerated using ammonia or ammonium salt when the PH of the seriflux after absorbing the SO2 is low than 6.2. Regeneration uses the method of direct regeneration or oxydizing regeneration, and the precipitate such as magnesium sulphites, magnesium hydroxide or magnesium carbonate get after regeneration can be periodic duty. After concentrating crystallization, the ammiaonia sulfate of liquid phase can get the ammonium sulphate crystals, and is also made to be a composite Crystals of ammonium sulphate and magnesium sulfate. The invention reduces the desulfurization cost without secondary pollution at the precondition for ensuring the effect desulfurization of flue gas.

Description

Technical field [0001] The invention relates to a method for desulfurization of flue gas using magnesium compound and ammonia cycle regeneration. The magnesium compound is used as a sulfur dioxide absorbent for flue gas desulfurization and purification. The generated magnesium sulfite or magnesium bisulfite is oxidized and regenerated with ammonia or ammonium salt It can be recycled later, and ammonium sulfate can be used as fertilizer. Background technique [0002] my country is the country that consumes the largest amount of coal in the world. The total amount of sulfur dioxide emitted by burning coal ranks first in the world, making my country the country with the most serious sulfur dioxide and acid rain pollution in the world. Therefore, it is imperative in our country to implement flue gas desulfurization technology for industrial and power station coal-fired boilers. [0003] There are many methods for flue gas desulfurization, among which calcium-based wet method is the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50
Inventor 晏乃强乔少华贾金平吴忠标
Owner SHANGHAI JIAO TONG UNIV
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