Integrated control method for low-temperature flue gas pollutants

A technology of low-temperature flue gas and control method, which is applied in the field of flue gas purification, and can solve problems such as the work effect needs to be improved, the industrial application is limited, and the microwave reactor is expensive.

Pending Publication Date: 2022-01-18
QINGDAO UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can achieve high removal efficiency, the stability and high energy consumption of the ozone generator in the high-dose ozone operation process are problems that must be faced; in addition, although the expensive microwave reactor can be heated efficiently, the long-term The continuous working effect needs to be improved, so the industrial application of this method is still limited

Method used

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  • Integrated control method for low-temperature flue gas pollutants
  • Integrated control method for low-temperature flue gas pollutants

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Particulate matter in flue gas, SO 2 , NO, Hg 0 Concentrations were 15 g / Nm 3 , 2000ppm, 400ppm and 50 μg / Nm 3 , flue gas temperature 110 o C. The flue gas flows through the agglomeration chamber (1) sequentially. At this time, the agglomeration agent storage tank (6) is opened, and it is sprayed into the agglomeration chamber (1) through the compressor and the two-fluid nozzle. The residence time of the flue gas in the agglomeration chamber is 3-5s. ; The outflowing flue gas enters the bag filter (2) for primary purification of dedusting; the primary purification flue gas enters the desulfurization tower (3), and the limestone slurry (8) is turned on for desulfurization, and the secondary purified flue gas after desulfurization The gas enters the oxidation reactor (4), turns on the ultra-micro bubble generator (7), the ultra-micro bubbles enter the oxidation reactor (4), triggers the oxidant (9) to form an oxidation reaction, the oxidation reaction time is 3-8s, and...

Embodiment 2

[0025] Particulate matter in flue gas, SO 2 , NO, Hg 0 Concentrations were 25 g / Nm 3 , 2000ppm, 400ppm and 70 μg / Nm 3 , flue gas temperature 105 o C. The flue gas flows through the agglomeration chamber (1) sequentially. At this time, the agglomeration agent storage tank (6) is opened, and it is sprayed into the agglomeration chamber (1) through the compressor and the two-fluid nozzle. The residence time of the flue gas in the agglomeration chamber is 3-5s. ; The outflowing flue gas enters the bag filter (2) for primary purification of dedusting; the primary purification flue gas enters the desulfurization tower (3), and the limestone slurry (8) is turned on for desulfurization, and the secondary purified flue gas after desulfurization The gas enters the oxidation reactor (4), turns on the ultra-micro bubble generator (7), the ultra-micro bubbles enter the oxidation reactor (4), triggers the oxidant (9) to form an oxidation reaction, the oxidation reaction time is 3-8s, and...

Embodiment 3

[0027] Particulate matter in flue gas, SO 2 , NO , Hg 0 Concentrations were 25 g / Nm 3 , 1450 ppm, 500ppm and 64 μg / Nm 3 , flue gas temperature 110 o C. The flue gas flows through the agglomeration chamber (1) sequentially. At this time, the agglomeration agent storage tank (6) is opened, and it is sprayed into the agglomeration chamber (1) through the compressor and the two-fluid nozzle. The residence time of the flue gas in the agglomeration chamber is 3-5s. ; The outflowing flue gas enters the bag filter (2) for primary purification of dedusting; the primary purification flue gas enters the desulfurization tower (3), and the limestone slurry (8) is opened for desulfurization, and the secondary purification smoke after desulfurization The gas enters the oxidation reactor (4), turns on the ultra-micro bubble generator (7), the ultra-micro bubbles enter the oxidation reactor (4), triggers the oxidant (9) to form an oxidation reaction, the oxidation reaction time is 3-8s, and...

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Abstract

The invention relates to an integrated control method for low-temperature flue gas pollutants. The method comprises the following steps that flue gas sequentially flows through an agglomeration chamber, a bag-type dust collector, a desulfurization tower, an oxidation reactor and an absorption tower, reaches an induced draft fan and then is discharged through a chimney. According to the invention, an existing dust removal technology and an existing oxidation technology are fully combined, mercury in flue gas is pre-oxidized through the auxiliary effect of an agglomerating agent, conversion of elemental mercury into particle mercury is enhanced, and a bag-type dust collector is used for achieving the dust removal and mercury removal synergistic effect; sulfur dioxide in the flue gas is removed once in a desulfurization tower, residual gaseous pollutants are subjected to gas-liquid oxidation reaction in an oxidation reactor, the oxidation process is enhanced through ultramicro bubbles, and then the synergistic effect of desulfurization, denitration and demercuration is performed in an absorption tower, so that the purification of the flue gas is completed; and compared with the prior art, the removal method provided by the invention has the advantages that the existing flue gas equipment is easy to transform, the installation and transformation cost is lower, and the treated flue gas can meet the emission requirement.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, and in particular relates to an integrated control method for dust removal, desulfurization, denitrification and mercury removal in low-temperature flue gas. Background technique [0002] Sulfur oxides (mainly SO 2 ), nitrogen oxides (NOx), trace amounts of heavy metals and fine particles and other pollutants; after acid gases are oxidized in the air, they contact with water to form acidic substances, which form acid rain in the process of atmospheric precipitation; in addition, nitrogen oxides are extremely It is easy to combine with hydrocarbons to form secondary pollution of photochemical smog; the emission of trace heavy metals has been ignored for a long time, but the mercury emitted by coal combustion exceeds 1,000 tons per year. Mercury stays in the atmosphere for a long time and migrates over long distances. It is difficult to degrade in the natural environment, and eventua...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/78B01D53/80B01D53/96B01D53/64B01D53/50B01D53/56B01D53/18B01D50/60
CPCB01D53/75B01D53/78B01D53/80B01D53/96B01D53/64B01D53/502B01D53/56B01D53/18B01D53/1406B01D53/1493B01D2251/902B01D2251/10B01D2251/106B01D2251/108B01D2251/404B01D2252/504B01D2257/602B01D2258/0283
Inventor 孙德帅刘鹏方龙张晓东陈照军巩玉苹
Owner QINGDAO UNIV
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