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Method and device for producing thiamine from surface dioxide in recovered waste gas

A sulfur dioxide and ammonium sulfate technology, applied in chemical instruments and methods, separation methods, ammonium sulfate, etc., can solve the problems of difficult glass fiber reinforced plastics, consumption of natural resources, high energy consumption, etc.

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 , is a greenhouse gas, and the investment is large and the energy consumption is high
The flue gas inlet temperature is generally between 120-160 °C, so it is difficult to choose FRP as the material of the desulfurization tower in the existing technology

Method used

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  • Method and device for producing thiamine from surface dioxide in recovered waste gas
  • Method and device for producing thiamine from surface dioxide in recovered waste gas

Examples

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Effect test

Embodiment 1

[0073] A 220T / h boiler, burning coal with a sulfur content of 1.5%, and a flue gas flow rate of 330,000 Nm 3 / hr, SO 2 The content is 3200mg / 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℃.

[0074] The desulfurization tower 1 has a diameter of 6m and a height of 18m. The tower body 101 is made of glass fiber reinforced plastic (FRP) with an average thickness of 23mm. Among them, the mass transfer member layer 104 uses grid packing, with an area of ​​65m 2 / m 3 , The height is 4m, the height of the oxidation crystallization pool is 8m.

[0075] After the flue gas passes through the reheater, the temperature drops to 110°C and enters the desulfurization tower. After being chilled by cold shock water, the temperature drops to 70℃, and then enters the mass transfer component layer, and the flow rate of the circulating absorption liquid is 500m 3 / h. The desulfurizer adopts 18% ammonia wat...

Embodiment 2

[0079] A 670T / h thermal power generating unit, namely 200MW, uses coal with a sulfur content of 3.0%, and a flue gas flow rate of 800,000 Nm 3 / hr, SO 2 The content is 7250mg / Nm 3 , The electrostatic precipitator is 3 electric fields, and the dust content of the flue gas is 250mg / Nm 3 , The flue gas temperature is 145℃.

[0080] The desulfurization tower has a diameter of 9.5m and a height of 20m. The shell is made of glass fiber reinforced plastic (FRP) with an average thickness of 26mm. The mass transfer layer adopts 100Y corrugated plate structured packing with an area of ​​100m 2 / m 3 , The height is 4m. The height of the oxidation crystallization pool is 8m.

[0081] After the flue gas passes through the reheater, the temperature drops to 110°C and enters the desulfurization tower. After being quenched by cold water, the temperature drops to 70℃, and then enters the mass transfer component layer, and the flow rate of the circulating absorption liquid is 3000m 3 / h. The desulf...

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Abstract

The present invention discloses method and apparatus for recovering SO2 from waste gas to produce ammonium sulfate. The present invention has combined process of oxidizing ammonium sulfite into ammonium sulfate and crystallizing ammonium sulfate to simplify structure of desulfurizing tower, lower its height and facilitate use of GRP material. Inside the desulfurizing tower, high temperature fume as material enters from the top, the desulfurized product is exhausted from the bottom, and both the fume and the absorbing liquid flow from top to bottom, resulting in high mass transfer efficiency, simple structure, great fume processing capacity and high eliminating efficiency of harmful SO2, SO3, NOx, HCl, HF and dust. The present invention has high industrial application.

Description

Technical field [0001] The invention relates to a method and device for processing and recovering sulfur dioxide in flue gas. Background technique [0002] Boilers or thermal power plants that use coal or petroleum as fuel emit a lot of 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 burning coal, SO 2 The content is usually 300-5000ppmv (1000-15000mg / Nm 3 )between. However, the amount of flue gas is very huge. As far as coal-fired boilers are concerned, the steam scale ranges from 35T / h to 2500T / h, the generator set capacity is 6MW to 1000MW, and the flue gas volume ranges 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 SO 2 It is an acid gas. The use of alkaline aqueous solution to remove SOx in smoke, namely flue gas desulfurization (FGD) is an effective method and has a wide range of applications. ...

Claims

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Application Information

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