Flue gas dry-process desulfurization and denitrification method based on ozone and carbide slag

A desulfurization, denitrification and dry desulfurization technology is applied in the field of flue gas dry desulfurization and denitrification, which can solve the problems of unfavorable ozone oxidation and low denitration efficiency, and achieve the effects of good flue gas appearance and high efficiency.

Inactive Publication Date: 2018-05-01
ZHONGJING ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method requires a higher temperature, which is extremely unfavorable for the oxidation of ozone
Therefore, the denitrification efficiency is low

Method used

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  • Flue gas dry-process desulfurization and denitrification method based on ozone and carbide slag
  • Flue gas dry-process desulfurization and denitrification method based on ozone and carbide slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The desulfurization and denitrification agent in this embodiment contains 5 parts by weight of magnesium oxide (the content of active magnesium oxide is 70 wt%), 2 parts by weight of catalyst, and 93 parts by weight of carbide slag (with a particle size of 200 mesh and a sieving rate greater than 95%). The catalyst formulation is shown in Table 2 below. The following parts by weight represent the weight ratio between the components, and the specific usage can be calculated accordingly.

[0049] Table 2. Catalyst formulation

[0050] TiO 2

60.0 parts by weight

ZrO 2

20.0 parts by weight

V 2 o 5

4.0 parts by weight

CeO 2

4.0 parts by weight

co 2 o 3

4.0 parts by weight

MnO 2

8.0 parts by weight

[0051] The flue gas (see Table 1) passes through the pre-dust collector to remove large particles in advance, and the dust content of the flue gas after dust removal is 20mg / Nm 3 , and then...

Embodiment 2

[0056] Desulfurization and denitrification were carried out in the same manner as in Example 1, except that the following conditions or material compositions were used. The desulfurization and denitrification agent in this embodiment includes: 10 parts by weight of magnesium oxide (active magnesium oxide content is 75 wt%), 2.4 parts by weight of catalyst, and 87.6 parts by weight of carbide slag. The catalyst formulation is shown in Table 4 below, increasing V 2 o 5 parts by weight. The following parts by weight represent the weight ratio between the components, and the specific usage can be calculated accordingly.

[0057] Table 4. Catalyst formulation

[0058]

[0059]

[0060] After desulfurization and denitrification with the above desulfurization and denitrification agents, the flue gas data at the detection outlet are shown in Table 5 below.

[0061] Table 5. Emissions from desulfurization and denitrification

[0062] serial number

Embodiment 3

[0064] Desulfurization and denitrification were carried out in the same manner as in Example 1, except that the following conditions or material compositions were used. The desulfurization and denitrification agent in this embodiment includes 15 parts by weight of magnesium oxide (the content of active magnesium oxide is 80 wt%), 3 parts by weight of catalyst, and 82 parts by weight of carbide slag. The catalyst formulation is shown in Table 6 below, MnO 2 Increased to 10 parts by weight. The following parts by weight represent the weight ratio between the components, and the specific usage can be calculated accordingly.

[0065] Table 6. Catalyst formulation

[0066] TiO 2

56.0 parts by weight

ZrO 2

20.0 parts by weight

V 2 o 5

6.0 parts by weight

CeO 2

4.0 parts by weight

co 2 o 3

4.0 parts by weight

MnO 2

10.0 parts by weight

[0067] Using this desulfurization and denitrification ag...

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Abstract

The invention discloses a flue gas dry-process desulfurization and denitrification method based on ozone and carbide slag. The flue gas dry-process desulfurization and denitrification method comprisesthe following steps: (1) a pre-oxidization step: enabling the ozone to be in contact with flue gas with the temperature of 100 to 130 DEG C and the flow speed of less than 5m/s, oxidizing at least part of nitrogen oxide in the flue gas, so as to form pre-oxidized flue gas; (2) a desulfurization and denitrification step: enabling the pre-oxidized flue gas to be in contact with dry powder of a desulfurization and denitrification agent, so as to remove at least part of sulfur dioxide and the nitrogen oxide in the flue gas, wherein the dry powder of the desulfurization and denitrification agent is prepared from the following components in parts by weight: 60 to 95 parts of the carbide slag, 5 to 30 parts of magnesium oxide and 1 to 5 parts of a catalyst. The method disclosed by the inventionhas high desulfurization and denitrification efficiency and the flue gas subjected to desulfurization and denitrification treatment has a good appearance.

Description

technical field [0001] The invention relates to a flue gas dry desulfurization and denitrification method, in particular to a flue gas desulfurization and denitrification method based on ozone and carbide slag. Background technique [0002] SO emissions from industrial flue gas 2 , NOx is the main source of air pollution. Therefore, the control of industrial flue gas SO 2 , NOx emission is the focus of air pollution prevention and control. [0003] For removal of SO 2 The traditional wet desulfurization technology is very mature, but the harm caused by wet desulfurization is becoming increasingly prominent. At present, more than 90% of the desulfurization process of coal-fired flue gas adopts wet desulfurization, that is, through the contact reaction between the injection of limestone slurry and the sulfur dioxide molecules in the flue gas, gypsum is finally formed. Most of the gypsum is collected by dehydration, but the tiny particles and water-soluble salts in the slu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/50B01D53/56B01D50/00
CPCB01D53/8609B01D50/00B01D53/8628B01D2251/104B01D2255/2065B01D2255/20707B01D2255/20715B01D2255/20723B01D2255/2073B01D2255/20746B01D2258/0283
Inventor 童裳慧
Owner ZHONGJING ENVIRONMENTAL TECH CO LTD
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