An integrated dry purification method and system for multi-component pollutants in flue gas

A pollutant and multi-component technology, applied in the field of flue gas purification, can solve the problems of complex process, different removal mechanism, high investment cost and saline wastewater, and achieve the effect of simple steps, high purification efficiency and short process

Active Publication Date: 2018-10-30
SHANGHAI LANKE PETROCHEM ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] With the progress of environmental protection technology, the purification technology of various pollutants in the flue gas is becoming more and more perfect, but the removal mechanism of different pollutants is different. At present, the tail gas treatment technology containing multiple pollutants generally adopts denitrification unit, bag dust removal and Spray to absorb acid gas, activated carbon adsorption (to remove dioxin or gaseous mercury) and other multi-unit solutions, the process is complicated, the investment cost is high and a large amount of saline wastewater will be generated

Method used

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  • An integrated dry purification method and system for multi-component pollutants in flue gas
  • An integrated dry purification method and system for multi-component pollutants in flue gas
  • An integrated dry purification method and system for multi-component pollutants in flue gas

Examples

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Embodiment 1

[0046] Embodiment 1 discloses an integrated dry purification method for flue gas multi-component pollutants, including steps:

[0047] S10: Add an alkali absorbent to the flue gas, the alkali absorbent and the acid gas (such as HCL, SO2) in the flue gas X ) reaction, and adsorb dioxins and gaseous metals, etc., to obtain the first flue gas, which includes soot, nitrogen oxides and alkaline particle absorbents;

[0048] S20: Add a reducing agent to the first flue gas to obtain a second flue gas, and the second flue gas includes soot, nitrogen oxides, an alkaline particle absorbent, and a reducing agent;

[0049] S30: Make the second flue gas pass through the SCR-FI catalytic filter assembly, the soot and alkaline particle absorbent in the second flue gas are intercepted on the surface of the SCR-FI catalytic filter assembly, the second The reducing agent and nitrogen oxides in the flue gas undergo a denitrification reaction in the SCR-FI catalytic filter assembly to generate n...

Embodiment 2

[0053] Compared with Embodiment 1, the method for integrated dry purification of flue gas multi-component pollutants in Embodiment 2 further includes step S50: collecting the soot and alkaline particle absorbent on the surface of the SCR-FI catalytic filter assembly.

[0054] By regularly collecting the soot and alkaline particle absorbent on the surface of the SCR-FI catalytic filter assembly, the SCR-FI catalytic filter assembly can be effectively cleaned, thereby ensuring the catalytic filtration effect of the SCR-FI catalytic filter assembly to a certain extent.

Embodiment 3

[0056] Compared with Example 1, the improvement of the integrated dry purification method for flue gas multi-component pollutants in Example 3 lies in:

[0057] In step S10, when the alkali absorbent is added to the flue gas, the molar ratio of the alkali absorbent to the acid gas in the flue gas is 2:1˜5:1. If the molar ratio of the alkali absorbent to the acid gas in the flue gas is too small, it is not conducive to the complete absorption of acid gas, dioxin, gaseous mercury and other gaseous metals, etc. If the ratio is too large, it will not only increase the absorption of the injected alkali The power consumption of the agent will increase the load of the SCR-FI catalytic filter assembly in the subsequent processing steps and reduce its operating life.

[0058] In step S10: passing the flue gas through a Venturi distributor, adding an alkali absorbent to the flue gas from the throat of the Venturi distributor, so that the alkali absorbent and the flue gas are uniformly m...

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Abstract

The invention discloses an integrated dry type purification method and system of flue gas multi-component pollutants. The integrated dry type purification method of the flue gas multi-component pollutants comprises the following steps: S10: adding an alkali absorbent into flue gas; removing pollution components including acidic gas, dioxin, gas-state metal and the like in the flue gas by the alkali absorbent, thus obtaining first flue gas; S20: adding a reducing agent into the first flue gas to obtain second flue gas; S30: enabling the second glue gas to pass through an SCR-FI catalysis filtering assembly, wherein smoke dust and the alkaline particle absorbent are intercepted on the surface of the SCR-FI catalysis filtering assembly, and the reducing agent and nitrogen oxide have a denitration reaction in the SCR-FI catalysis filtering assembly to generate nitrogen gas and water; S40: discharging clean flue gas. The integrated dry type purification method of the flue gas multi-component pollutants, disclosed by the invention is short in flow and simple in process, and can be used for effectively removing the pollution components including the smoke dust, the dioxin, the multi-component acidic gas, the nitrogen oxide and the like in the flue gas; no wastewater is generated, the investment cost is low, and the purification efficiency is high.

Description

technical field [0001] The invention relates to the technical field of flue gas purification methods and system design, in particular to an integrated dry purification method and system for multi-component pollutants in flue gas. Background technique [0002] Smoke is a gas produced by the combination reaction of combustible components and oxygen in the air. The composition of the smoke is determined by the fuel, air, and the oxidation and decomposition reactions carried out. When solid and liquid fuels are completely combusted, carbon and oxides generate carbon dioxide, hydrogen and oxides generate water vapor, sulfur and oxides generate sulfur dioxide, and nitrogen and oxides generate NO X , the moisture in the fuel is vaporized into water vapor, chlorine is converted into hydrogen chloride, and the remaining nitrogen in the air and oxygen in the excess air, etc., and some incombustible inorganic substances and charcoal that are too late to burn will produce semi-coke and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/75B01D53/78B01D53/76B01D53/83B01D53/86B01J23/30B01J23/28B01D53/68B01D53/60B01D53/64B01D53/70
CPCB01D53/60B01D53/64B01D53/68B01D53/70B01D53/75B01D53/76B01D53/78B01D53/83B01D53/865B01D2251/2062B01D2251/2067B01D2251/304B01D2251/404B01D2257/2064B01D2257/602B01J23/002B01J23/28B01J23/30B01J2523/00B01J2523/69B01J2523/55B01J2523/47B01J2523/68Y02A50/20
Inventor 马洪玺李雷张文军
Owner SHANGHAI LANKE PETROCHEM ENG & TECH
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