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A coal-fired boiler flue gas wet desulfurization and denitrification and wastewater treatment device and process

A technology for wet desulfurization and wastewater treatment, applied in gas treatment, separation methods, air quality improvement, etc., can solve problems such as easily ignited flue, gypsum quality impact, treatment, etc.

Active Publication Date: 2018-12-04
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ozone is easily decomposed into oxygen at a flue gas temperature of 130°C, resulting in a decrease in the utilization rate of ozone. At the same time, it is easy to ignite the glass flake anti-corrosion layer in the flue, so it is necessary to spray water to cool down or replace the material of the flue
High-valence nitrogen oxides enter the desulfurization system and are absorbed into corresponding nitrates and nitrites, which will have a certain impact on the quality of gypsum, and no further treatment of nitrates and nitrites

Method used

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  • A coal-fired boiler flue gas wet desulfurization and denitrification and wastewater treatment device and process
  • A coal-fired boiler flue gas wet desulfurization and denitrification and wastewater treatment device and process
  • A coal-fired boiler flue gas wet desulfurization and denitrification and wastewater treatment device and process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0124] The flue gas volume of a coal-fired boiler is 59723m3 / h, NOx349mg / Nm 3 , SO 2 1501mg / Nm 3 After the initial flue gas enters the wet desulfurization and denitrification and wastewater treatment process, the liquid-gas ratio of wastewater to flue gas in the wastewater evaporation cooling section is 0.02L / m 3 , the rapping period of the mist eliminator is 30s, the atomized particle size D50 is 60 μm; the molar ratio of the ozone injected into the flue gas in the oxidation section to the nitrogen oxides in the flue gas is n O3 :n NO =2.5; the supergravity level of the supergravity device in the supergravity absorption section is 500, and the liquid-gas ratio is 5L / m 3, the pH value of the desulfurization and denitrification absorbent circulation tank is 8; in the wastewater oxidation and denitrification section, the amount of sulfite and the amount of oxidizing air are 3mol / m 3 , the added denitrification agent n 氨基磺酸 :n 亚硝酸根 = 2.0. Export NOx9mg / Nm after this proces...

Embodiment 2

[0126] The flue gas volume of a coal-fired boiler is 61723m3 / h, NOx365mg / Nm 3 , SO 2 1461mg / Nm 3 After the initial flue gas enters the wet desulfurization and denitrification and wastewater treatment process, the liquid-gas ratio of wastewater to flue gas in the wastewater evaporation cooling section is 0.01L / m 3 , the rapping cycle of the demister is 130s, the atomized particle size D50 is 120 μm; the molar ratio of ozone injected into the flue gas in the oxidation section to nitrogen oxides in the flue gas is n O3 :n NO =1.5; the supergravity level of the supergravity device in the supergravity absorption section is 300, and the liquid-gas ratio is 4L / m 3 , the pH value of the desulfurization and denitrification absorbent circulation tank is 7; in the wastewater oxidation and denitrification section, the amount of sulfite and the amount of oxidizing air are 6mol / m 3 , the added denitrification agent n 氨基磺酸 :n 亚硝酸根 = 1.5. Export NOx12mg / Nm after this process 3 , SO 2...

Embodiment 3

[0128] The flue gas volume of a coal-fired boiler is 57723m3 / h, NOx333mg / Nm 3 , SO 2 1601mg / Nm 3 After the initial flue gas enters the wet desulfurization and denitrification and wastewater treatment process, the liquid-gas ratio of wastewater to flue gas in the wastewater evaporation cooling section is 0.015L / m 3 , the rapping cycle of the demister is 200s, the atomized particle size D50 is 300μm; the molar ratio of the ozone injected into the flue gas in the oxidation section to the nitrogen oxides in the flue gas is n O3 : n NO =1.0; the supergravity level of the supergravity device in the supergravity absorption section is 100, and the liquid-gas ratio is 8L / m 3 , the pH value of the desulfurization and denitrification absorbent circulation tank is 4; in the waste water oxidation and denitrification section, the amount of sulfite and the amount of oxidizing air are 3mol / m 3 , the added denitrification agent n 氨基磺酸 :n 亚硝酸根 = 1.0. Export NOx11mg / Nm after this process ...

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Abstract

The invention discloses a device and technology for wet desulfurization and denitrification of flue gas of a coal-fired boiler and treatment of wastewater .The technological process includes the steps that the flue gas enters a wastewater evaporative cooling stage through a draught fan outlet to be cooled and then enters an ozonation stage, the flue gas is fully mixed with ozone to be oxidized and then enters a supergravity device through a supergravity desulfurization and denitrification device inlet, the flue gas is subjected to forcible absorption with desulfurization and denitrification absorption liquid in a packed bed on a rotor, and finally the flue gas is demisted by a demister and then discharged through a flue gas outlet of the supergravity device .Replacement absorbent slurry is subjected to oxidation and denitrification treatment in sequence and then returned to the evaporative cooling stage to perform spraying cooling on the flue gas .By means of the device and the technology, desulfurization and denitrification efficiency is improved, and meanwhile water consumption is low; wastewater generated in desulfurization and denitrification is subjected to innocent treatment, sulfate is collected, and thus the coal-fired flue gas can meet stricter discharge standards.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a process for wet desulfurization and denitrification of flue gas from a coal-fired boiler and waste water treatment. Background technique [0002] my country is the world's largest coal producer and consumer, and coal still accounts for a large proportion of my country's energy structure. For many years, coal has accounted for more than 75% of my country's total primary energy consumption. It is estimated that coal will still account for about 70% of total energy consumption in the next 10 years. And the consumption pattern will not change. The energy consumption structure dominated by coal is the most important reason for the increasingly serious pollution in our country. [0003] Desulfurization and denitrification in the coal-fired flue gas pollution control technology of industrial boilers are often completed in multiple independent systems. The hierarchical t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/76B01D53/78B01D53/60B01D53/73
CPCB01D53/60B01D53/73B01D53/76B01D53/78B01D2251/104B01D2258/0283Y02A50/20
Inventor 王岳军王凯寿冬金吴忠标冯斌莫建松毛明春
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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