Method and device for producing thiamine from sulfur dioxide in recorered smoke

A technology of sulfur dioxide and ammonium sulfate, applied in chemical instruments and methods, separation methods, ammonium sulfate and other directions, can solve problems such as consumption of natural resources, failure of ammonia method to develop well, pollution and other problems

Inactive Publication Date: 2005-08-03
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The discarding method has obvious disadvantages: consumption of new natural resources; waste gas turning into waste residue, bringing new pollution; and emission of CO at the same time 2 , for the greenhouse gas
This will not only cause waste loss of ammonia, but also cause new pollution
[0033] The above problems are also one of the reasons why the ammonia process has not developed well in the past for a long time

Method used

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  • Method and device for producing thiamine from sulfur dioxide in recorered smoke
  • Method and device for producing thiamine from sulfur dioxide in recorered smoke

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] use figure 2 the process described.

[0107] A 260T / h thermoelectric boiler, burning coal with a sulfur content of 0.8%, and a flue gas flow rate of 340,000 Nm 3 / hr, SO 2 The content is 2000mg / Nm 3 , the electrostatic precipitator is 4 electric fields, and the dust content of the flue gas is 80mg / Nm 3 , the flue gas temperature is 140°C.

[0108] The diameter of the desulfurization tower is 7m, the height is 25, SO 2 The absorption section adopts a layer of padding.

[0109] After the flue gas passes through the pre-cooling on the flue inlet pipe, the temperature drops to 95°C, and then enters the flue gas humidification and cooling section of the desulfurization tower, where the temperature drops to 50.5°C, and then enters the SO 2 In the absorption section, the desulfurization efficiency is 95.6%, and then enters the ammonia recovery section, the desulfurization efficiency increases to 99.3%, and when leaving the desulfurization tower after the defoaming secti...

Embodiment 2

[0113] use figure 2 process.

[0114] A 300,000 kW thermal power generation unit burns coal with a sulfur content of 2.5%, and the flue gas flow rate is 1.1 million Nm 3 / hr, SO 2 The content is 6285mg / Nm 3 , the electrostatic precipitator is 4 electric fields, and the dust content of the flue gas is 100mg / Nm 3 , the flue gas temperature is 145°C.

[0115] The diameter of the desulfurization tower is 12m, the height is 28m, SO 2 The absorption section adopts two layers of packing.

[0116] After the flue gas passes through the pre-cooling on the flue inlet pipe, the temperature drops to 95°C, and then enters the flue gas humidification and cooling section of the desulfurization tower, where the temperature drops to 50.5°C, and then enters the SO 2 In the absorption section, the desulfurization efficiency is 96.6%, and then enters the ammonia recovery section, the desulfurization efficiency increases to 99.6%, and when leaving the desulfurization tower after the defoamin...

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Abstract

The present invention discloses method and apparatus for recovering SO2 from fume to produce ammonium sulfate. The present invention has ammonia recovering section over the absorbing section to avoid loss of ammonia and independent fume cooling and humidifying section to produce ammonium sulfate crystal in a saturation and crystallization process in lowered steam energy consumption. Hydraulic staged cyclonic unit is used as effective liquid-solid separator to raise the crystallization degree of the ammonium sulfate product. The whole desulfurizing system produces no waste and has no secondary pollution. The desulfurizing tower has high eliminating efficiency of harmful SO2, SO3, NOx, HCl, HF and dust.

Description

technical field [0001] The invention relates to a treatment and recovery method and device for sulfur dioxide in flue gas, in particular to a treatment method using ammonia as a raw material. Background technique [0002] Coal or oil-fired boilers or thermal power plants emit large amounts of exhaust gas (flue gas, flue gas). These flue gases contain harmful substances such as SOx, NOx, HCl and HF, among which SOx is the main substance that forms acid rain. Depending on the type of coal burned, SO 2 The content is usually 300-5000ppmv (1000-15000mg / Nm 3 )between. However, the amount of flue gas is huge. In terms of coal-fired boilers, the steam scale ranges from 35T / h to 2500T / h, the capacity of the generating set ranges from 6MW to 1000MW, and the flue gas amount varies from 50,000 Nm 3 / h to 2.5 million Nm 3 , SO 2 Emissions from 1,000 tons / year to 100,000 tons / year. Thanks to SO 2 It is an acidic gas, and the use of alkaline aqueous solution to remove SOx in the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50C01C1/24
Inventor 肖博文
Owner EAST CHINA UNIV OF SCI & TECH
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