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Ammonium sulfite oxidation process and device

An oxidation device, the technology of ammonium sulfite, is applied in the chemical method, ammonia compound, inorganic chemistry and other directions of reacting liquid and gas medium, which can solve the problem of reducing the oxidation rate, achieve the improvement of the oxidation rate, prevent the escape of sulfur dioxide, prevent the The effect of ammonia escape

Active Publication Date: 2013-07-24
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The experimental results show that at high concentrations, the oxidation rate decreases with the increase of sulfite concentration, and high concentrations of ammonium sulfite cannot be rapidly and completely oxidized directly into ammonium sulfate

Method used

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  • Ammonium sulfite oxidation process and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] A sintering plant, 2 sets 260m 2 The sintering flue gas ammonia desulfurization project adopts this oxidation process, and the SO in the flue gas 2 The concentration is 2316mg / m 3 , the pH value of the slurry at the entrance of the oxidation tank is controlled at 7.0, the flow rate of the slurry in the oxidation tank 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, the distance between the porous plates is 2.0m, and 2 layers The hole diameter of the porous plate is 10mm, the distance between the holes is 30mm, and the pressure at the top of the oxidation tank is controlled at 0.05MP. The oxidation rate of the slurry out of the tank is 99.8%, and the concentration of ammonium sulfate in the slurry after oxidation is 33.7%.

Embodiment 2

[0056] In a thermal power plant, the flue gas ammonia desulfurization project of two 135WM units adopts this oxidation process, and the SO in the flue gas 2 The concentration is 3560mg / m 3 , the pH value of the slurry at the entrance of the oxidation tank is controlled at 7.1, the flow rate of the slurry in the oxidation tank is 45m / h, the O / S ratio of the oxidation air is controlled at 3, the outlet aperture of the oxidation air pipe is 10mm, the distance between the porous plates is 2.0m, and 3 layers The hole diameter of the perforated plate is 10mm, the hole center distance is 40mm, and the pressure at the top of the oxidation tank is controlled at 0.05MP. The oxidation rate of the slurry out of the tank is 99.9%, and the concentration of ammonium sulfate in the slurry after oxidation is 32.6%.

Embodiment 3

[0058] A self-provided power plant, a 410t / h boiler flue gas ammonia desulfurization project adopts this oxidation process, the SO in the flue gas 2 The concentration is 1830mg / m 3 , the pH value of the slurry at the entrance of the oxidation tank is controlled at 7.0, the flow rate of the slurry in the oxidation tank is 50m / h, the O / S ratio of the oxidation air is controlled at 3, the outlet aperture of the oxidation air pipe is 10mm, the distance between the porous plates is 2.0m, and 2 layers The hole diameter of the perforated plate is 10mm, the hole center distance is 35mm, and the pressure at the top of the oxidation tank is controlled at 0.05MP. The oxidation rate of the slurry out of the tank is 99.9%, and the concentration of ammonium sulfate in the slurry after oxidation is 33.7%.

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Abstract

The invention discloses an ammonium sulfite oxidation process and device. The device comprises an oxidation tank of which the bottom is provided with a slurry discharge pump, and also comprises an ammonification pipeline, an oxidation air duct and a plurality of layers of porous plates arranged at intervals, wherein the ammonification pipeline is communicated with the top of the oxidation tank; the oxidation air duct is arranged in the oxidation tank and is positioned on the lower part; and the porous plates are arranged in the oxidation tank and are positioned in the middle part. The ammonium sulfite slurry is fed into a slurry tank, ammonia water is added to regulate the pH value of the ammonium sulfite slurry to be 6-8, the ammonium sulfite slurry is fed into the oxidation tank from the top of the oxidation tank, and the ammonium sulfite slurry slowly flows to the bottom of the oxidation tank from the top of the oxidation tank; the oxidized air is jetted into small bubbles through the oxidized air duct and enters the ammonium sulfite slurry, and the small bubbles are crushed through the porous plates and are contacted with the ammonium sulfite slurry for carrying out an oxidation reaction; and the slurry is pumped by the slurry discharge pump after the oxidation reaction is ended. According to the device, the ammonium sulfite in high-concentration ammonium sulfate solution can be rapidly oxidized, the recovery cost of the ammonium sulfate is reduced, and ammonium and sulfur dioxide are prevented from escaping in the oxidization process.

Description

technical field [0001] The invention relates to the field of resources and environmental protection, in particular to an oxidation process and device for ammonium sulfite in ammonia desulfurization. Background technique [0002] my country is the country with the largest emission of sulfur dioxide in the world. Sulfur dioxide pollution has caused acid rain on more than 1 / 3 of my country's land area, making it one of the three main acid rain areas in the world. Sulfur dioxide pollution has become a global environmental concern. At present, the FGD processes put into commercial application all over the world mainly include: limestone (lime)-gypsum method, flue gas circulating fluidized bed desulfurization, spray drying desulfurization, calcium spraying in furnace flue gas humidification activation desulfurization, seawater desulfurization, ammonia method and electron beam method. [0003] Ammonia desulfurization process is a green process that uses ammonia or liquid ammonia ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J10/00C01C1/246
Inventor 莫建松吴忠标程常杰李泽清
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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