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Flue gas pollutant control integrated purification process

A purification process and pollutant technology, which is applied in the direction of air quality improvement, chemical instruments and methods, and separation of dispersed particles, can solve the problems of low removal rate of flue gas pollutants and high operating costs, and achieve enhanced removal efficiency, Low operating cost and improved contact area

Inactive Publication Date: 2014-06-25
CHENGDU HUAXITANG INVESTMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The above three patents respectively disclose the conventional application of sodium-alkali dry desulfurization, sodium-alkali wet desulfurization and absorbents containing sodium-alkali. The removal rate of flue gas pollutants is low and the operating cost is high.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0041] An integrated purification process for flue gas pollutant control, the specific steps are as follows:

[0042] A. The flue gas and sodium bicarbonate dry powder are continuously sent into the circulating fluidized bed reactor, and the flue gas makes the sodium bicarbonate dry powder in a fluidized state and reacts with it to initially remove sulfur oxides and nitrogen oxides in the flue gas;

[0043] B. Send the flue gas after preliminary desulfurization and denitrification in step A to the desulfurization section of the absorption tower, use sodium bicarbonate aqueous solution as the absorption liquid to spray from the upper part, and contact with the flue gas entering from the lower part in countercurrent, and remove the flue gas Sulfur oxides and other acidic components;

[0044] C. The desulfurized flue gas enters the denitrification section of the absorption tower, and the oxidant solution containing sodium bicarbonate is used as the absorption liquid to spray from...

Embodiment 2

[0046] An integrated purification process for flue gas pollutant control, the specific steps are as follows:

[0047] A. Spray sodium bicarbonate dry powder directly into the flue, react with flue gas, and initially remove sulfur oxides and nitrogen oxides;

[0048] B. Send the flue gas after preliminary desulfurization and denitrification in step A to the desulfurization section of the absorption tower, use sodium bicarbonate aqueous solution as the absorption liquid to spray from the upper part, and contact with the flue gas entering from the lower part in countercurrent, and remove the flue gas Sulfur oxides and other acidic components;

[0049] C. The desulfurized flue gas enters the denitrification section of the absorption tower, and the oxidant solution containing sodium bicarbonate is used as the absorption liquid to spray from the upper part to further remove nitrogen oxides in the flue gas. The purified flue gas is discharged from the absorption tower. Drain the top...

Embodiment 3

[0051] The implementation mode of this embodiment is basically the same as embodiment 1, on this basis:

[0052] The solid reaction product discharged from the bottom of the circulating fluidized bed reactor and the absorption liquid discharged from the bottom of the desulfurization section and denitrification section of the absorption tower are sent to the recovery treatment system.

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Abstract

The invention provides a flue gas pollutant control integrated purification process for simultaneously removing SOx, NOx and mercury in flue gas. The process comprises the following steps: (A) flue gas and sodium bicarbonate dried powder are continuously fed into a circulating fluidized bed reactor, the flue gas fluidizes the sodium bicarbonate dried powder and reacts with the powder, or the sodium bicarbonate dried powder is directly sprayed into a gas flue to react with flue gas for preliminary removal of oxysulfide and nitrogen oxides; (B) the flue gas desulfurized and denitrated preliminarily in the step (A) is sent to a desulfurization section of an absorption tower, and oxysulfide and other acidic components in the flue gas are removed by spraying sodium bicarbonate water solution as the absorption liquid from the top to countercurrent contact the flue gas entering from the lower part; (C) the desulfurized flue gas enters the denitration section of the absorption tower, nitrogen oxides in the flue gas are removed by spraying an oxidant solution containing sodium bicarbonate as the absorption liquid from the top, and the purified flue gas is discharged from the top of the absorption tower.

Description

technical field [0001] The invention relates to the technical field of flue gas desulfurization and denitrification, in particular to an integrated purification process for controlling flue gas pollutants. Background technique [0002] In view of the long-term existence of my country's coal-based energy structure and the rapid development of industrialization in recent years, SOx and NOx have become the main air pollutants in my country, and have caused serious damage to the ecological environment in various forms such as acid rain and smog. , had a great negative impact on the entire national economic life. [0003] Flue gas desulfurization and denitrification are the most important measures for air pollution control. At present, there are many flue gas desulfurization technologies at home and abroad, such as limestone-gypsum method, ammonia method, double alkali method, and rotary spray method. Problems such as blockage, difficult disposal of desulfurization by-products, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/83B01D53/78B01D53/60B01D53/64
CPCY02A50/20
Inventor 任毅李东林郎治
Owner CHENGDU HUAXITANG INVESTMENT
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