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A treatment method for low-temperature flue gas

A technology of low-temperature flue gas and treatment method, which is applied in the directions of gas treatment, separation method, chemical instrument and method, etc., can solve the problem of incapable of simultaneous desulfurization and denitration treatment of low-temperature flue gas.

Active Publication Date: 2022-04-22
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a treatment method for low-temperature flue gas in order to overcome the problem that the prior art cannot directly perform simultaneous desulfurization and denitrification treatment on low-temperature flue gas

Method used

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  • A treatment method for low-temperature flue gas
  • A treatment method for low-temperature flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051](1) Conduct gas-liquid contact reaction between low-temperature flue gas (temperature 35°C) and liquid complexing agent, control the volume ratio of liquid complexing agent and low-temperature flue gas to 1:1, the reaction temperature is 35°C, and the reaction time is 10s, to obtain the exhausted liquid complexing agent and the flue gas from which nitrogen oxides and hydrogen sulfide have been removed;

[0052] (2) Carry out tempering treatment with the invalidated liquid complexing agent obtained in step (1), control the concentration of the obtained tempering liquid complexing agent to be 0.7% by weight, and the pH value is 6.5;

[0053] (3) The tempering liquid complexing agent obtained in step (2) is regenerated under stirring, the reaction temperature is controlled to be 70°C, the reaction time is 60min, and the stirring speed is 500rpm to obtain a regenerated liquid complexing agent, which is recycled for use in In step (1).

Embodiment 2

[0055] (1) Conduct gas-liquid contact reaction between low-temperature flue gas (temperature 45°C) and liquid complexing agent, control the volume ratio of liquid complexing agent and low-temperature flue gas to 3:1, the reaction temperature is 45°C, and the reaction time is 7s, to obtain the exhausted liquid complexing agent and the flue gas from which nitrogen oxides and hydrogen sulfide have been removed;

[0056] (2) Carry out tempering treatment to the invalidated liquid complexing agent obtained in step (1), control the concentration of the obtained tempering liquid complexing agent to be 0.8% by weight, and the pH value is 7;

[0057] (3) The conditioning liquid complexing agent obtained in step (2) is subjected to a regeneration reaction under stirring, the controlled reaction temperature is 80° C., the reaction time is 45 minutes, and the stirring speed is 350 rpm to obtain a regenerated liquid complexing agent, which is recycled for use in In step (1).

Embodiment 3

[0059] (1) Conduct gas-liquid contact reaction between low-temperature flue gas (temperature 50°C) and liquid complexing agent, control the volume ratio of liquid complexing agent and low-temperature flue gas to 5:1, the reaction temperature is 50°C, and the reaction time is 5s, to obtain the exhausted liquid complexing agent and the flue gas from which nitrogen oxides and hydrogen sulfide have been removed;

[0060] (2) Carry out tempering treatment to the invalidated liquid complexing agent obtained in step (1), control the concentration of the obtained tempering liquid complexing agent to be 0.9% by weight, and the pH value is 7.5;

[0061] (3) The conditioning liquid complexing agent obtained in step (2) is subjected to a regeneration reaction under stirring, the reaction temperature is controlled at 90° C., the reaction time is 30 min, and the stirring speed is 150 rpm.

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Abstract

The invention relates to the field of environmental protection, and discloses a method for processing low-temperature flue gas. The method includes the following steps: (1) performing a gas-liquid contact reaction between low-temperature flue gas and a liquid complexing agent to obtain an invalid liquid complexing agent and a Remove the flue gas of nitrogen oxides and hydrogen sulfide; (2) carry out tempering treatment to step (1) gained invalid liquid complexing agent, obtain tempering liquid complexing agent; (3) step (2) gained tempering liquid The complexing agent is regenerated to obtain a regenerated liquid complexing agent. It can remove nitrogen oxides and hydrogen sulfide in low-temperature flue gas at the same time, and overcomes the problem of post-treatment of low-temperature flue gas in the traditional method, and can directly perform gas-liquid contact reaction with low-temperature flue gas; liquid complexation The agent can be regenerated, and the recycling of the liquid complexing agent is realized; the method has the characteristics of environmental protection, resource saving and good recyclability.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a method for processing low-temperature flue gas. Background technique [0002] During the production, transportation and loading and unloading of steel and coking fields, a large amount of flue gas will be generated, and the flue gas contains nitrogen oxides (NO x ) and hydrogen sulfide (H 2 S), direct discharge will cause great harm to human beings and the environment. [0003] At present, the methods for treating nitrogen oxides and hydrogen sulfide in flue gas are mainly for the treatment of flue gas with higher temperature, and there has been no mature and feasible method for the treatment of low-temperature flue gas. Contents of the invention [0004] The object of the present invention is to provide a treatment method for low-temperature flue gas in order to overcome the problem in the prior art that simultaneous desulfurization and denitrification cannot be dir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/52B01D53/56B01D53/78B01D53/96
CPCB01D53/78B01D53/52B01D53/56B01D53/96B01D2258/0283
Inventor 王建山刘鹏举邱正秋张小龙
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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