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an arsenic and so 3 Dry purification method of smelting flue gas

A smelting flue gas, dry technology, applied in the field of flue gas purification, can solve the problems of inability to effectively remove arsenic, difficult to realize resource utilization, difficult to separate adsorbents, etc., achieve efficient synergistic removal ability, improve enterprise economic benefits, The effect of reducing the processing cost

Active Publication Date: 2022-03-11
SHANGHAI JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Chinese invention patent ZL201510203636.0 discloses a method for dry removal of sulfur trioxide and heavy metals from flue gas from non-ferrous smelting acid production. Although this patent also uses dry capture technology, SO 3 / Heavy metal adsorbents are sprayed into the flue at the same time, making it difficult to separate multiple adsorbents mixed together, so it is also difficult to realize the resource utilization of the two types of pollutants; moreover, the heavy metal that this focus focuses on is zero-valent mercury, and its corresponding Adsorbents mainly adsorb and capture heavy metal mercury in flue gas, and cannot effectively remove arsenic

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  • an arsenic and so <sub>3</sub> Dry purification method of smelting flue gas

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Comparison scheme
Effect test

Embodiment 1

[0034] In this example, a 10,000 m 3 / h flue gas, and set up a pilot flue gas purification device. The pilot plant is equipped with a cooling spray system, a cyclone dust collector, an adsorbent injection device, a fluidized bed reactor and a bag filter.

[0035] Arsenic and SO 3 The dry purification method of smelting flue gas, such as figure 1 shown, including the following steps:

[0036] (1) The cooling spray system uses a gas-liquid two-phase atomizing nozzle to spray a certain amount of cooling water and compressed air into the flue before the entrance of the cyclone dust collector to cool the flue gas temperature from 300°C to 170°C , so that the gaseous arsenic in the flue gas condenses into As 2 o3 Solid particles precipitated. At the same time, the flue gas temperature is close to SO 3 Acid dew point, partial SO 3 Exist in the form of sulfuric acid aerosol which is more easily captured by the adsorbent;

[0037] Among them, the flue gas in the flue comes from...

Embodiment 2

[0048] The present invention utilizes above-mentioned pilot plant to carry out effect verification. First, the temperature of the flue gas extracted is 300°C, and the As in the flue gas 2 o 3 The concentration is about 20mg / m 3 . Into the flue gas according to 6m 3 Spray cooling water into the flue at a speed of / min, and reduce the temperature of the flue gas to about 170°C before the cyclone inlet. As in flue gas after cyclone dust collector 2 o 3 Concentration decreased to 6mg / m 3 about. Further increase the injection speed of cooling water to 6.8L / min, and the flue gas temperature before the cyclone inlet will be as low as about 125°C. As in flue gas after cyclone dust collector 2 o 3 Concentration decreased to 3mg / m 3 about.

[0049] Adopt present embodiment method, total arsenic recovery rate is up to more than 98%, to SO 3 The removal rate can reach more than 98%.

Embodiment 3

[0051] The present invention utilizes above-mentioned pilot plant to carry out effect verification. First, the temperature of the flue gas extracted is 300°C, and the SO in the flue gas 3 The concentration is about 3000mg / m 3 . Spray calcium carbonate powder into the flue gas at a rate of 40kg / h into the flue in front of the fluidized bed reactor; the flue gas passes through the fluidized bed reactor and the bag filter in turn. SO in the flue gas at the outlet of the bag filter 3 The concentration is reduced to 1000mg / m 3 . Continue to increase the feeding rate of calcium carbonate powder to 80kg / h, then the flue gas SO at the outlet of the bag filter 3 Concentration reduced to 300mg / m 3 .

[0052] Adopt present embodiment method, total arsenic recovery rate is up to more than 99%, to SO 3 The removal rate can reach more than 99%.

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Abstract

The present invention relates to a kind of arsenic and SO 3 The method for dry-type purification of smelting flue gas comprises the following steps: 1) spraying an aqueous solution into the flue gas in the waste heat boiler and the high-temperature dust collector to lower the temperature to form solid particles; (2) using the cyclone dust collector to collect the solid particles; (3) The adsorbent is sprayed into the outlet flue of the cyclone dust collector, and the adsorption reaction is carried out in the flue and the reactor; (4) The adsorbent and the residual solid As 2 o 3 Collected to form smoke; (5) Part of the smoke is transported back to the reactor through the circulation device to continue the reaction, and the remaining smoke is returned to the furnace as a smelting ingredient. Compared with the prior art, the present invention can realize arsenic and SO 3 Synchronous capture of multi-pollutants such as, the total arsenic recovery rate is as high as 95% 3 The removal rate can reach more than 95%, which has obvious environmental protection and economic benefits. In addition, the present invention also has efficient synergistic purification functions for fine particles, mercury, fluorine and chlorine in flue gas.

Description

technical field [0001] The invention relates to a flue gas purification method, in particular to a method containing arsenic and SO 3 Dry purification method for smelting flue gas. Background technique [0002] The output of ten conventional non-ferrous metals in my country has ranked first in the world for more than ten consecutive years. The rapid development of non-ferrous metal smelting has brought about increasingly serious environmental problems, especially the most representative gas pollutants such as sulfur dioxide and heavy metals emitted during the smelting process. Therefore, my country has promulgated extremely strict non-ferrous metal smelting flue gas pollutant emission standards, aiming at reducing the pollutant emission of non-ferrous metal smelting flue gas. [0003] Smelting raw materials generally contain a certain concentration of arsenic, and a large amount of As is formed during the roasting process. 2 o 3 smelting flue gas. In high temperature fl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/83B01D53/50B01D53/46
CPCB01D53/83B01D53/508B01D53/46B01D2257/55
Inventor 晏乃强瞿赞刘伟纪蕾朋洪钦源
Owner SHANGHAI JIAOTONG UNIV
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