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Method and device for simultaneous desulfurization and denitrification of flue gas

A technology for desulfurization, denitrification and flue gas is applied in the field of flue gas purification, which can solve the problems of large investment, high operating cost and high ozone consumption, and achieve the effects of low operating cost, energy saving and simple process.

Active Publication Date: 2018-07-24
BEIJING CPCEP ENERGY CONSERVATION & ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a flue gas desulfurization and denitrification method and device in view of the shortcomings of the current simultaneous desulfurization and denitrification technologies of various flue gases, which have large investment, high ozone consumption, and high operating costs.

Method used

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  • Method and device for simultaneous desulfurization and denitrification of flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] The flue gas is firstly dedusted in the dust collector, and the main composition of the dedusted flue gas is SO 2 The concentration is 1500ppm, the NO concentration is 600ppm, the oxygen content in the flue gas is 6.0% (volume), and the temperature is 150°C.

[0068] at 5000Nm 3 Pass the dust-removed flue gas into the intake flue 1 at a speed of 5.1kg / h, pass the ozone prepared in the ozone generator 2 into the intake flue 1 at a speed of 5.1kg / h, mix the two at 150°C, and react (Pre-oxidation) to obtain a mixed gas, wherein the amount of ozone added is equivalent to 0.8 times the molar amount of NO.

[0069] The mixed gas enters the desulfurization and denitrification tower 3 from the outlet of the intake flue 1 (a spray tower is used in this implementation), runs from the bottom of the desulfurization and denitrification tower 3 upwards, and the absorption liquid flows from the upper part of the desulfurization and denitrification tower 3 at a flow rate of 50t / h. Th...

Embodiment 2

[0073] The flue gas is firstly dedusted in the dust collector, and the main composition of the dedusted flue gas is SO 2 The concentration is 1000ppm, the NO concentration is 400ppm, the oxygen content in the flue gas is 7.4%, and the temperature is 120°C.

[0074] at 10000Nm 3 Pass the flue gas after dedusting into the intake flue 1 at a speed of 5.1kg / h, pass the ozone prepared in the ozone generator 2 into the intake flue 1 at a speed of 5.1kg / h, mix the two at 120°C, and react (Pre-oxidation) to obtain a mixed gas, wherein the amount of ozone added is equivalent to 0.6 times the molar amount of NO.

[0075] The mixed gas enters the desulfurization and denitrification tower 3 from the outlet of the intake flue 1 (in this implementation, a plate corrugated structured packing tower is used), and runs from the bottom of the desulfurization and denitrification tower 3 from bottom to top, and the absorption liquid flows from the desulfurization and denitrification tower at a fl...

Embodiment 3

[0079] The flue gas is firstly dedusted in the dust collector, and the main composition of the dedusted flue gas is SO 2 The concentration is 2000ppm, the NO concentration is 300ppm, the oxygen content in the flue gas is 6.5%, and the temperature is 110°C.

[0080] at 7000Nm 3 Pass the flue gas after dedusting into the intake flue 1 at a speed of 2.3kg / h, pass the ozone prepared in the ozone generator 2 into the intake flue 1 at a speed of 2.3kg / h, mix the two at 110°C, and react (Pre-oxidation) to obtain a mixed gas, wherein the amount of ozone added is equivalent to 0.5 times the molar amount of NO.

[0081] The mixed gas enters the desulfurization and denitrification tower 3 from the outlet of the intake flue 1 (a spray tower is used in this implementation), runs from the bottom of the desulfurization and denitrification tower 3 from bottom to top, and the absorption liquid flows from the upper part of the desulfurization and denitrification tower 3 at a flow rate of 140t / ...

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Abstract

The invention provides a method for simultaneously desulfurizing and denitrifying flue gas. The method comprises the following steps: (1) mixing flue gas and ozone to obtain a mixed gas according to the molar ratio that ozone to nitrogen oxides is (0.5-0.8):1; (2) contacting the mixed gas obtained in the step (1) with an absorption liquid which is prepared from sodium hydroxide and / or potassium hydroxide and hexammine cobalt (III) chloride. The invention further provides a device for simultaneously desulfurizing and denitrifying flue gas. The device comprises a gas inlet flue, an ozone generator, a desulfurization and denitrification tower, a gas outlet flue and a sprayer, wherein the outlet of the gas inlet flue is connected with the bottom of the desulfurization and denitrification tower; the ozone output opening of the ozone generator is connected with the inlet of the gas inlet flue; the sprayer is positioned at the upper part of the desulfurization and denitrification tower; and the gas outlet flue is positioned at the top of the desulfurization and denitrification tower. The method and the device have a remarkable desulfurization and denitrification effect, are simple in process and low in cost, and have the effects that the ozone consumption is only 50-80 percent of the molar weight of NOx in flue gas, the desulfurization rate is over 98 percent, and the denitrification rate is over 80 percent, and mostly over 90 percent.

Description

technical field [0001] The invention relates to the field of flue gas purification, in particular, the invention relates to a method for simultaneous desulfurization and denitrification of flue gas and a device used for the method. Background technique [0002] my country is a large developing country whose energy structure is dominated by coal, and its coal consumption exceeds half of the total global consumption. In my country's coal production, more than 80% of the coal is used for direct combustion, and coal combustion produces a large amount of SO 2 , NO x It has caused a series of air pollution problems such as acid rain, greenhouse effect and ozone layer destruction. According to the 2013 China Environmental Bulletin, in 2014 my country's SO 2 The total emission was 19.744 million tons, and the total emission of nitrogen compounds was 20.780 million tons. Of the 161 cities that carried out air quality monitoring in 2014, only 16 met the air quality standard; among...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/75B01D53/78B01D53/60B01D53/86B01D53/76
CPCY02A50/20
Inventor 郭少鹏江浩单选户白云峰初炜马志刚纳宏波陈雪王德俊韩玉维刘亚刘洋
Owner BEIJING CPCEP ENERGY CONSERVATION & ENVIRONMENTAL PROTECTION TECH CO LTD
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