Method and device of removing SO2 in flue gas by acid-ammonia method

A technology of SO2 and flue gas, applied in separation methods, chemical instruments and methods, and separation of dispersed particles, etc., can solve the problems of slow ammonium sulfite oxidation speed, little use value of by-products, limited use of ammonia method, etc., and achieve saving Effects of equipment cost, time cost reduction, and energy consumption reduction

Inactive Publication Date: 2017-02-22
昆明新光能源环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The by-product of the ammonia-ammonium sulfate method can be used as a fertilizer. Since ammonia is a volatile substance, it will inevitably be taken away by the flue gas, and it will be accompanied by ammonia volatilization loss during desulfurization. Limited by the operating conditions of the flue gas, the higher the flue gas temperature , the greater the loss, the greater the flue gas volume, and the SO 2 The lower the concentration, the more is taken away by the flue gas, the greater the loss, the greater the loss, the higher the operating cost, and the use of the ammonia method is limited; most of the products obtained by the ammonia-ammonium sulfate method are ammonium sulfite, which requires a higher It is oxidized to ammonium sulfate with air at high temperature, and the oxidation speed of ammonium sulfite is very slow, requiring larger oxidation equipment
The cost of other sodium method or double alkali method is also high, and the value of by-product utilization is not great, and the enterprise is under great economic pressure

Method used

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  • Method and device of removing SO2 in flue gas by acid-ammonia method
  • Method and device of removing SO2 in flue gas by acid-ammonia method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] An Acid-Ammonia Method for Removing SO from Flue Gas 2 The device, the reaction device includes a blower for blowing flue gas, H connected to the blower 2 SO 4 Reaction equipment, neutralization reaction equipment, ammonium sulfate crystallization treatment equipment, water recycling equipment, the H 2 SO 4 Between the reaction equipment and the neutralization reaction equipment, between the neutralization reaction equipment and the ammonium sulfate crystallization treatment equipment, between the ammonium sulfate crystallization treatment equipment and the water circulation recovery equipment, between the water circulation recovery equipment and the H 2 SO 4 The reaction devices are connected by pipelines and pumps.

[0046] The H 2 SO 4 The reaction equipment comprises the first foam reaction tower 2 and the second foam reaction tower 3 connected in series, the first sulfuric acid storage tank 4, the first circulation pump 5, the second sulfuric acid storage tan...

Embodiment 2

[0052] Utilize the device that embodiment 1 provides to remove SO in flue gas 2 ;Anode calcining flue gas volume: 60000Nm 3 / h, SO 2 Concentration: 3000mg / Nm 3 , pressurized by the pressure blower 1, the flue gas enters the foam tower 2 connected in series in the first stage, and the foam tower 3 connected in series in the second stage. Contact with acid solution to remove SO in sulfuric acid tail gas 2 , the purified flue gas passes through the demister 25 in the tower to remove mist droplets, and the purified flue gas after demisting is emptied by the chimney.

[0053] Manganese sulfate is added in the second dilute acid storage tank 6 in the mode of dropping after being dissolved by catalyst dissolving tank 8, is sent to the top of secondary foam tower 3 by the second circulating pump 7, and manganese sulfate solution flows from the aperture of reaction plate to Downflow absorbs SO 2 , to absorb SO 2 Finally, dilute acid (sulfuric acid) is obtained and enters the seco...

Embodiment 3

[0064] On the basis of Example 1, the two-stage series foam reaction tower is changed to the first-stage foam reaction tower, the flue gas volume of the aluminum electrolytic cell: 108000Nm 3 / h,SO 2 Concentration: 400mg / Nm 3 , because SO 2The concentration is low, and the first-stage desulfurization process is adopted. Pressurized by the pressurized blower 1, enters the first-stage foam tower 2 with a diameter of 3.8m, contacts with dilute acid solution containing catalyst from top to bottom, and removes SO in the sulfuric acid tail gas 2 , the purified flue gas is demistered in the tower to remove mist droplets, and the purified flue gas after demisting is emptied by the chimney, and the process parameters are the same as in Example 2. The flue gas is treated, SO 2 The removal rate is more than 85%. Compared with the existing technology, the energy consumption is saved by more than 30%, and the investment and operation cost is reduced by more than 20%.

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Abstract

The invention discloses a method and device of removing SO2 in flue gas by an acid-ammonia method. The reaction device comprises an air blower used for blowing the flue gas, sulfuric acid reaction equipment connected with the air blower, neutralization reaction equipment, ammonium sulfate crystallization treatment equipment and water recycle recovery equipment; and the sulfuric acid reaction equipment and the neutralization reaction equipment, the neutralization reaction equipment and the ammonium sulfate crystallization treatment equipment, the ammonium sulfate crystallization treatment equipment and the water recycle recovery equipment as well as the water recycle recovery equipment and the sulfuric acid reaction equipment are respectively connected to each other through a pipeline and a pump. The device is not limited by flue gas operation conditions, can be used when the temperature of the flue gas is within 100 DEG C, and can be used under any condition without being limited by the amount of the flue gas and the concentration of the SO2; and the SO2 in the flue gas and oxygen in the flue gas are at a high oxidation speed under the action of a catalyst, the SO2 and O2 synchronously produce sulfuric acid in an aqueous solution without a specially arranged oxidizing reaction device, and thus a process is simpler than an ammonia-ammonium sulfate method.

Description

technical field [0001] The invention belongs to industrial processing SO 2 Technical field, especially relate to a kind of acid-ammonia method to remove SO in flue gas 2 method and device. Background technique [0002] Flue gas desulfurization methods are classified according to the phase of the desulfurizer. It can be roughly divided into two types: dry desulfurization and wet desulfurization. Dry desulfurization: the use of solid-phase absorbents, adsorbents or catalysts to remove SO from flue gas 2 . The advantage is that there are no waste acid and waste water treatment facilities, and the SO 2 It can be used in places with low concentration; the disadvantage is that the desulfurization efficiency is low and unstable, and the equipment is huge; the adsorbent is not used for a long time and needs to be replaced regularly, and the replacement of the adsorbent is labor-intensive to cause secondary pollution of dust; Can not be regenerated, resulting in high operating ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/78B01D53/86B01D53/73B01D53/96
CPCB01D53/502B01D53/73B01D53/86B01D53/96B01D2251/608
Inventor 宁平殷在飞殷梁淘张秋林殷颖贾丽娟
Owner 昆明新光能源环保科技有限公司
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