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Double-tower desulfurization and denitrification system and method adopting ozone oxidation in cooperation with multi-stage circulating spraying

A technology of circulating spraying, desulfurization and denitrification, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of incomplete oxidation of NO, complex by-product components, restrictions on the popularization and application of ozone oxidation, etc. Effect of smoke phenomenon, reduction of competing reactions, reduction of equipment corrosion

Pending Publication Date: 2020-07-31
GUANGDONG J TECH ENVIRONMENT SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the engineering application of ozone oxidation and denitrification, there are problems such as incomplete oxidation of NO in flue gas and complex by-product components, which limit the popularization and application of ozone oxidation.

Method used

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  • Double-tower desulfurization and denitrification system and method adopting ozone oxidation in cooperation with multi-stage circulating spraying
  • Double-tower desulfurization and denitrification system and method adopting ozone oxidation in cooperation with multi-stage circulating spraying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] This embodiment provides a dual-tower desulfurization and denitrification system with ozone oxidation and two-stage circulating spraying. The dual-tower desulfurization and denitrification system is as follows: figure 1 As shown, it includes a desulfurization device 3 and a denitrification device 18 connected to the flue gas outlet of the desulfurization device 3. The liquid outlet at the bottom of the desulfurization device 3 is connected to the denitrification device 18, and the absorption liquid collected at the bottom of the desulfurization device 3 is passed into the denitrification device 18 as a denitrification liquid. use.

[0074] The inlet flue 1 of the desulfurization device 3 is connected to the ozone generator 2, and the ozone generator 2 is connected to the inlet flue 1 of the desulfurization device 3 through the ozone injection pipeline, and the outlet end of the ozone injection pipeline faces the flue gas intake direction , after the flue gas enters the ...

Embodiment 2

[0082] In this example, the desulfurization and denitrification system provided in Example 1 is used to desulfurize and denitrify the flue gas, and the SO in the flue gas 2 The concentration is 320mg / Nm 3 , NO in flue gas x The concentration is 220mg / Nm 3 , the processing method specifically includes the following steps:

[0083] (1) The ozone generator 2 sprays 2kg / h of ozone into the inlet flue 1, and the flue gas flows at 5000Nm 3 After the flow rate of / h enters the inlet flue 1, it contacts with ozone to oxidize. The molar ratio of ozone to NO in the flue gas is 0.5:1, and the contact time is 1s. The oxidized flue gas enters the desulfurization device 3;

[0084] (2) After the flue gas enters the desulfurization device 3, it first enters the circulating spray area 4, and in the circulating spraying area 4, the flue gas and the desulfurization liquid NaOH solution of the circulating spray are countercurrently contacted and reacted to form Na 2 SO 3 Realize initial des...

Embodiment 3

[0089] In this example, the desulfurization and denitrification system provided in Example 1 is used to desulfurize and denitrify the flue gas, and the SO in the flue gas 2 The concentration is 560mg / Nm 3 , NO in flue gas x The concentration is 260mg / Nm 3 , the processing method specifically includes the following steps:

[0090] (1) The ozone generator 2 sprays 4kg / h of ozone into the inlet flue 1, and the flue gas flows at 6000Nm 3 The flow rate of / h enters the inlet flue 1 and contacts with ozone for oxidation. The molar ratio of ozone to NO in the flue gas is 0.55:1, and the contact time is 0.7s. The oxidized flue gas enters the desulfurization device 3;

[0091] (2) After the flue gas enters the desulfurization device 3, it first enters the circulating spray area 4, and in the circulating spraying area 4, the flue gas and the desulfurization liquid NaOH solution of the circulating spray are countercurrently contacted and reacted to form Na 2 SO 3 Realize initial des...

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Abstract

The invention provides a double-tower desulfurization and denitrification system and a double-tower desulfurization and denitrification method adopting ozone oxidation in cooperation with multistage circulating spraying. The system comprises a desulfurization device and a denitrification device connected with the top of the desulfurization device, wherein the bottom of the desulfurization device is communicated with the bottom of the denitrification device; an ozone generation device is connected to an inlet flue of the desulfurization device; the interior of the desulfurization device is sequentially divided into a circulating spraying area and at least one layer of oxidation absorption area along the flow direction of flue gas, and an ozone spraying device and a desulfurization liquid spraying device positioned above the ozone spraying device are arranged in the oxidation absorption area. Nitric oxide in the flue gas is converted into nitrogen dioxide by adopting the strong oxidizingproperty of ozone; the flue gas is subjected to multi-stage circulating spraying and ozone oxidation in the desulfurization device, SO2 in the flue gas is gradually removed, and deep oxidation of theflue gas is realized, so that the concentration of a solution carried in the flue gas is very low, the white smoke phenomenon of a wet desulfurization system is relieved, and the equipment corrosionis reduced.

Description

technical field [0001] The invention belongs to the technical field of flue gas desulfurization and denitrification, and relates to a double-tower desulfurization and denitrification system and method with ozone oxidation synergy, in particular to a double-tower desulfurization and denitrification system and method with ozone oxidation synergy with multi-stage circulation spraying. Background technique [0002] Nitrogen oxides (NO x ) is one of the main sources of air pollution, and it is also a major problem in air pollution control. Commonly referred to as nitrogen oxides (NO x ) including N 2 O, NO, NO 2 and N 2 o 3 etc. Among them, NO and NO are mainly polluting the atmosphere 2 . [0003] NO emissions from human activities x Although only naturally occurring NO x About 1 / 10 of that, but due to the high emission concentration and concentrated locations, the harm is very great. NO x The harms to the natural environment and human production and life caused by th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/76B01D53/56B01D53/78B01D53/50
CPCB01D53/76B01D53/56B01D53/501B01D2251/104B01D2251/304B01D2251/604B01D2258/0283
Inventor 钟璐杨颖欣胡静龄刘勇胡小吐杨森林
Owner GUANGDONG J TECH ENVIRONMENT SCI CO LTD
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