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Method, system and product for reclaiming sulfoxides from flue gas

A technology for sulfur oxides and sulfur recovery, applied in chemical instruments and methods, separation methods, ammonium sulfate, etc., can solve the problems of consuming natural resources, difficult to use FRP, and large investment, and achieve large processing capacity and short construction period , reduce the effect of investment

Inactive Publication Date: 2007-10-17
娄爱华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 and 160°C. Therefore, it is difficult to choose FRP as the material of the sulfur oxide absorption tower in the existing technology

Method used

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  • Method, system and product for reclaiming sulfoxides from flue gas
  • Method, system and product for reclaiming sulfoxides from flue gas

Examples

Experimental program
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Effect test

Embodiment 1

[0080] A 220T / h boiler burns coal with a sulfur content of 1.5%, and the flue gas flow rate is 260,000 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°C. The sulfur oxide absorption tower 1 has a diameter of 6.3m and a height of 22m. The tower body 101 is made of FRP with an average thickness of 32mm. Among them, the mass transfer member 104 adopts grid packing with an area of ​​65m 2 / m 3 , with a height of 3.5m.

[0081] The temperature of the flue gas is 135°C, and it is sent to the sulfur oxide absorption tower by the booster fan, where it contacts the absorption liquid and enters the mass transfer component layer. The flow rate of the circulating absorption liquid is 1450m 3 / h. The desulfurization agent adopts 18% concentration of ammonia water mixture, the flow rate is 2.5m 3 / h. The sulfur removal rate is 98.5%, SO in the tail ga...

Embodiment 2

[0084] A 670T / h thermal power generation unit, namely 200MW, burns coal with a sulfur content of 0.8%, and the flue gas flow rate is 800,000 Nm 3 / hr, the electrostatic precipitator is 3 electric fields, and the dust content of the flue gas is 200mg / Nm 3 , the flue gas temperature is 125°C.

[0085] The sulfur oxide absorption tower has a diameter of 10.0m and a height of 25m. The tower body is made of FRP with an average thickness of 38mm. Among them, the mass transfer layer is fine liquid droplets produced by the atomizing nozzle of the absorbing liquid distributor, with an average diameter of 1 mm.

[0086] The temperature of the flue gas is 135°C, and it is sent to the sulfur oxide absorption tower by the booster fan, where it contacts the absorption liquid and enters the mass transfer component layer. The flow rate of the circulating absorption liquid is 3250m 3 / h. The desulfurization agent uses 99.6% concentration of liquefied ammonia with a flow rate of 1.26m 3 / h....

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Abstract

The present invention relates to a method and a system for recovering oxysulfide from flue gases, and the recovered products thereof. In the present invention, the process of oxidizing ammonium sulfite to ammonia sulfate and the crystallization process of ammonia sulfate are carried out at the bottom of the oxysulfide absorbing tower, thereby the structure of the oxysulfide absorbing tower is simplified and the height of the oxysulfide absorbing tower is reduced; the flue gases inlet is arranged at the top of the oxysulfide absorbing tower, and the flue gases outlet is arranged at the middle part of the oxysulfide absorbing tower, so that the flue gases with highest temperature is positioned at the top of the oxysulfide absorbing tower, while the flue gases temperature at other parts of the tower is less than 70 DEG C, thereby the oxysulfide absorbing tower is adapted to be integratedly manufactured by fiber glass reinforced plastics material, and excellent corrosion resistance and shorter construction cycle can be realized. The bottom of the oxysulfide absorbing tower is named as crystallization and oxidation reactor; the flue gases and absorbing liquid flow downwards from the top of the tower in a concurrent flow manner inside of the oxysulfide absorbing tower, and the oxysulfide absorbing tower has a simple structure, a large handling capacity, a high sulfur removing efficiency, and has a major industrialization prospect.

Description

technical field [0001] The invention relates to a purification treatment and recovery method, system and product of sulfur oxides in flue gas. Background technique [0002] Boilers or thermal power plants that use coal or oil as fuel emit large amounts of flue gas. These flue gases contain harmful substances such as SOx, NOx, HCl and HF, among which sulfur oxides SOx, including SO 2 and SO 3 , 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. Since SOx is an acidic gas, the use of alkaline aqueous solution to remove SOx from flue gas, that is, Flue Gas Desulfu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/24B01D53/50
Inventor 娄爱华
Owner 娄爱华
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