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Flue gas desulfurization and denitrification system and method adopting ozone sectional oxidation in cooperation with urea absorption

A technology for desulfurization and denitrification, flue gas, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of failure to achieve standard discharge, energy saving and consumption reduction, inability to coordinate dosage and removal efficiency, and decline in denitrification efficiency, etc. problems, to achieve the effects of saving production energy consumption and denitrification costs, avoiding discoloration of flue gas, and improving utilization

Inactive Publication Date: 2020-02-28
GUANGDONG J TECH ENVIRONMENT SCI CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] But the existing 3 Oxidation synergistic absorption flue gas desulfurization and denitrification technology, unable to coordinate O 3 The relationship between dosage and removal efficiency, there is O 3 Due to the problems of large dosage and high operating costs, it is impossible to achieve the unification of emission standards and energy saving and consumption reduction. Moreover, the ozone denitrification technology is due to the high price of nitrogen oxides after oxidation, especially NO 2 A disproportionation reaction occurs during the absorption process, and about one-third of the molar ratio of NO is re-released, resulting in a decrease in denitrification efficiency

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  • Flue gas desulfurization and denitrification system and method adopting ozone sectional oxidation in cooperation with urea absorption

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Embodiment 1

[0076] This embodiment provides a flue gas desulfurization and denitrification method with ozone staged oxidation and urea absorption. The flue gas desulfurization and denitrification system provided in the specific embodiment is used to desulfurize and denitrify glass kiln flue gas, wherein the O in the glass kiln flue gas 2 , SO 2 and nitrogen oxides (as NO 2 meter) concentrations are 10%, 500mg / m 3 , 700mg / m 3 , the specific processing method includes the following steps:

[0077] (I) 50000Nm 3 The flue gas per hour enters the heat extraction device 1, where it exchanges heat with the circulating medium, the temperature of the flue gas is lowered from 80°C to 50°C, the temperature of the circulating medium rises, and the cooled flue gas flows to the first ozone dosing point When the position is 2, it is in contact with the ozone sprayed into the flue gas circulation pipeline for countercurrent oxidation, the total amount of ozone and the NO in the flue gas x The molar ...

Embodiment 2

[0083] This embodiment provides a flue gas desulfurization and denitrification method with ozone staged oxidation and urea absorption. The flue gas desulfurization and denitrification system provided in the specific embodiment is used to desulfurize and denitrify the flue gas of the industrial boiler, wherein the O in the flue gas of the industrial boiler is 2 , SO 2 and nitrogen oxides (as NO 2 meter) concentrations were 8%, 600mg / m 3 , 450mg / m 3 , the specific processing method includes the following steps:

[0084] (I) 100000Nm 3 The flue gas per hour enters the heat extraction device 1, where it exchanges heat with the circulating medium, the temperature of the flue gas is lowered from 100°C to 80°C, the temperature of the circulating medium rises, and the cooled flue gas flows to the first ozone dosing point When the position is 2, it is in contact with the ozone sprayed into the flue gas circulation pipeline for countercurrent oxidation, the total amount of ozone and...

Embodiment 3

[0090] This embodiment provides a flue gas desulfurization and denitrification method with ozone staged oxidation and urea absorption. The flue gas desulfurization and denitrification system provided in the specific embodiment is used for desulfurization and denitrification of coke oven flue gas, wherein the O in coke oven flue gas 2 , SO 2 and nitrogen oxides (as NO 2 meter) concentrations were 8%, 550mg / m 3 , 550mg / m 3 , the specific processing method includes the following steps:

[0091] (I) 300000Nm 3 The flue gas per hour enters the heat extraction device 1, where it exchanges heat with the circulating medium, the temperature of the flue gas is lowered from 150°C to 100°C, the temperature of the circulating medium rises, and the cooled flue gas flows to the first ozone dosing point When the position is 2, it is in contact with the ozone sprayed into the flue gas circulation pipeline for countercurrent oxidation, the total amount of ozone and the NO in the flue gas x...

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Abstract

The invention provides a flue gas desulfurization and denitrification system and a flue gas desulfurization and denitrification method based on ozone sectional oxidation in cooperation with urea absorption. The desulfurization and denitrification system comprises a denitrification device and a desulfurization device which are connected in sequence along the flow direction of flue gas, wherein thedenitration device is circularly connected with a spraying liquid storage device, the spraying liquid storage device is externally connected with a urea supply device, the urea supply device is used for conveying urea into spraying liquid, and the spraying liquid mixed with urea is used for circular spraying on flue gas introduced into the denitration device; at least two ozone adding points are arranged on a flue gas circulation pipeline contained in the desulfurization and denitrification system, an ozone generating device is respectively and independently connected into the ozone adding points, and the ozone generating devices is used for spraying ozone into flue gas flowing through the corresponding ozone adding points. According to the invention, a multi-point addition mode of ozone sectional oxidation is adopted, the utilization rate of ozone is improved, and urea spraying is combined on the basis of ozone oxidation, so that the production energy consumption and the denitration cost are greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of flue gas treatment, and relates to a flue gas desulfurization and denitrification system and method, in particular to a flue gas desulfurization and denitrification system and method in which ozone staged oxidation cooperates with urea absorption. Background technique [0002] Nitrogen oxides (NO x ) and sulfur dioxide (SO 2 ) is the main pollutant of all kinds of flue gas. NO x and SO 2 Emissions into the atmosphere not only directly endanger human health, but also cause a series of environmental problems such as smog, acid rain and photochemical smog. Therefore, controlling NO x and SO 2 emissions are crucial to improving the quality of the atmospheric environment. [0003] The mainstream technologies for flue gas desulfurization and denitrification include wet flue gas desulfurization, SCR flue gas denitrification, activated carbon / coke flue gas desulfurization and denitrification, and flue gas c...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/76B01D53/78B01D53/50B01D53/56
CPCB01D53/343B01D53/50B01D53/56B01D53/75B01D53/76B01D53/78B01D2251/104B01D2257/302B01D2257/404B01D2258/0283
Inventor 胡小吐胡静龄杨颖欣钟璐刘勇薛学良杨森林
Owner GUANGDONG J TECH ENVIRONMENT SCI CO LTD