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Flue gas desulfurization and denitration process and device for recovering ammonium sulfate

A technology of desulfurization, denitrification and ammonium sulfate, applied in inorganic chemistry, ammonia compound, dispersed particle separation, etc., can solve the problems of low oxidation rate, ammonium sulfite oxidation and absorption contradiction, etc., achieve high oxidation rate, increase instability, Achieving the effect of oxidation rate

Active Publication Date: 2015-05-20
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is in contradiction with the oxidation requirements of ammonium sulfite, because when the concentration of ammonium sulfite is too high, its oxidation rate is low, how to solve the contradiction between the oxidation and absorption of ammonium sulfite is a difficult problem that ammonia desulfurization needs to face
[0009] Second, there is a hidden danger of secondary pollution:

Method used

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  • Flue gas desulfurization and denitration process and device for recovering ammonium sulfate

Examples

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Effect test

Embodiment 1

[0077] In a thermal power plant, the flue gas desulfurization project of two 410T / h boilers adopts this process, and the SO in the flue gas 2 The concentration is 5125mg / m 3 , NO X The concentration is 367mg / m 3 , the pH value of the slurry at the top of the oxidation tank is controlled at 7.0 by adding ammonia, the flow rate of the slurry in the oxidation zone is 40m / h, the O / S ratio of the oxidation air is controlled at 3, the outlet aperture of the oxidation air pipe is 8mm, and the distance between the porous plates is 2.0m , the hole diameter of the 2-layer perforated plate is 10mm, the hole center distance is 30mm, and the concentrated spray liquid-gas ratio in the concentrated area is 1.5L / m 3 , The solid content is controlled at 5%-10%, the slurry residence time in the thickening tank is 2 hours, the solid content is controlled at 18%-20%, and the liquid-gas ratio of the desulfurization spray layer is controlled at 2.0L / m 3 , The liquid-gas ratio of the denitrificat...

Embodiment 2

[0079] A self-provided power plant, a 135MW unit boiler flue gas desulfurization project adopts this process, SO in the flue gas 2 The concentration is 2866mg / m 3 , NO X The concentration is 423mg / m 3 , the pH value of the slurry at the top of the oxidation tank is controlled at 6.8 by adding ammonia, the flow rate of the slurry in the oxidation zone is 35m / h, the O / S ratio of the oxidation air is controlled at 2.8, the outlet hole diameter of the oxidation air pipe is 8mm, and the distance between the porous plates is 2.0m , the hole diameter of the 3-layer perforated plate is 10mm, the hole center distance is 30mm, and the concentrated spray liquid-gas ratio in the concentrated area is 1.5L / m 3 , The solid content is controlled at 5%-10%, the slurry residence time in the thickening tank is 2 hours, the solid content is controlled at 18%-20%, and the liquid-gas ratio of the desulfurization spray layer is controlled at 1.0L / m 3 , The liquid-gas ratio of the denitrification ...

Embodiment 3

[0081] In a thermal power plant, three 130T / h boiler flue gas desulfurization projects adopt this process, SO in the flue gas 2 The concentration is 1870mg / m 3 , NO X The concentration is 416mg / m 3 , the pH value of the slurry at the top of the oxidation tank is controlled at 7.0 by adding ammonia, the flow rate of the slurry in the oxidation zone is 40m / h, the O / S ratio of the oxidation air is controlled at 2.5, the outlet aperture of the oxidation air pipe is 8mm, and the distance between the porous plates is 2.0m , the hole diameter of the 2-layer perforated plate is 10mm, the hole center distance is 30mm, and the concentrated spray liquid-gas ratio in the concentrated area is 1.0L / m 3 , The solid content is controlled at 5%-10%, the slurry residence time in the thickening tank is 2 hours, the solid content is controlled at 18%-20%, and the liquid-gas ratio of the desulfurization spray layer is controlled at 1.0L / m 3 , The liquid-gas ratio of the denitrification spray la...

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Abstract

The invention discloses a flue gas desulfurization and denitration process and device for recovering ammonium sulfate. The flue gas desulfurization and denitration device comprises an absorption tower, a crystal extracting and concentrating tank and an ammonia storage tank, wherein the absorption tower is sequentially provided with a defogger layer, a desulfurization spraying layer, a denitration spraying layer, a liquid accumulation layer, a concentrated solution spraying layer and a concentration tank from top to bottom; the crystal extracting and concentrating tank is communicated with the concentration tank, and the downstream side of the crystal extracting and concentrating tank is sequentially connected with a swirler and a centrifuge; the inside of an oxygen tank is partitioned into a regulation zone and an oxidation zone which are both communicated to the liquid accumulation layer, the regulation zone is communicated with the denitration spraying layer through a denitration circulating pump, the oxidation layer is respectively communicated with the desulfurization spraying layer and the concentration tank through a desulfurization circulating pump, and the bottom of the oxidation zone is provided with an oxidation air duct above which a plurality of layers of porous plates are arranged; and the ammonia storage tank is used for adjusting the pH value of slurry from the liquid accumulation layer. On the premise of ensuring higher desulfurization efficiency, the flue gas desulfurization and denitration process and device can be used for effectively controlling escape of sulfur dioxide and ammonia of a system, greatly increasing the denitration efficiency of the system and realizing the large-particle crystallization of ammonium sulfate crystals.

Description

technical field [0001] The invention relates to the field of resource and environmental protection, in particular to a flue gas desulfurization and denitrification process and device for recovering ammonium sulfate. Background technique [0002] Flue gas desulfurization technology can be divided into wet method, dry method and semi-dry method according to the dry and wet state of absorbent and desulfurization product in the desulfurization process. The wet FGD technology uses a solution or slurry containing an absorbent to desulfurize in a wet state. The wet desulfurization technology has the advantages of fast desulfurization reaction rate, simple equipment, and high desulfurization efficiency. The commercial desulfurization technology commonly used in the world is calcium-based wet method, represented by limestone (lime) gypsum method, accounting for more than 90%. [0003] With the large-scale application of calcium-based wet desulfurization technology in my country, som...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/60C01C1/245
Inventor 李泽清莫建松吴忠标程常杰
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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