This desulphurization system adopts high-efficient turbulent absorption towerand unique design, which can purify the flue gas further, guarantee the high-quality and high desulphurization rate of the sulphuric acid ammonium, guarantee the high utilization ratio of the ammonia water, and reduce the forming of the aerosol of ammonia. This system adopts the crystallization process inside the tower, the sulphuric acid ammonium solution after absorbing and oxidizing shall be heated through the flue gas, evaporate water and form the sulphuric acid ammonium crystallization. Then, it may send to follow-up system for further treatment and save a large amount of steam consumption.

 

鍋爐來的煙氣通過引風機后進入脫硫湍沖噴射管進行除塵和一級脫硫，煙氣與一級吸收湍沖器的噴射漿液接觸，形成湍沖面。在氣液充分接觸下，煙氣中的SO2溶解于水中形成亞硫酸進而與漿液中的硫酸銨發(fā)生化學反應(yīng)，生成亞硫酸氫銨和硫酸氫銨。然后進入脫硫塔進行二級脫硫。煙氣中的二氧化硫被吸收后，通過除水段，離開脫硫塔，尾氣溫度為48～65℃，由脫硫塔頂直接進入煙囪排放。漿液與煙氣接觸并吸收二氧化硫生成亞硫酸銨后，吸收生成的亞硫酸銨溶液在脫硫塔的氧化段與鼓入的空氣發(fā)生氧化反應(yīng)生成硫酸銨溶液。

 

The flue gas from boiler may enter into the turbulent spraying pipeline of desulphurization through the air-introduced unit for dust removal and primary desulphurization. The flue gas contact with the spraying liquid of primary absorbing turbulent unit and rapidly form and the turbulent surface. Under the circumstances that the liquid is fully contracted with gas each other; SO2 in the flue gas may dissolve in water and form the sulfurous acid. Then, it will result the chemical reaction with the ammonia sulfate in the serous fluid, which may generate the ammonium bisulfite and ammonium hydrogen sulfite. Then enters the desulphurization tower and carry on second desulphurization. After the sulfur dioxide in the flue gas is absorbed, it shall pass through the water removal section and leave the desulphurization tower. The tail gas temperature is about 48- 65degrees Centigrade, which shall enter into the chimney and directly discharge from the top of the tower of the desulphurization. After the contacting of serous fluid and flue gas absorb the sulfur dioxide to generate the ammonium sulfite, the ammonium base sulfite solution may react with the pumping air in the oxidizing section of desulphurization tower and generate the ammonium sulfate.

 

吸收氧化后產(chǎn)生的硫酸銨溶液經(jīng)鍋爐煙氣在激冷段加熱，蒸發(fā)掉里面的水分，形成硫酸銨結(jié)晶，用硫銨排放泵進入硫銨料液罐，隨后由旋流器進料泵將料液送入硫銨旋流器，使硫銨漿液中的固含量達到～50％，稀相返回硫銨料液罐，濃相流入臥式螺旋卸料過濾離心機分離得到的固體硫銨（含水量2~3%），再進入流化床干燥器，使硫銨產(chǎn)品的含水量≤1%，然后進入料倉和包裝機，即可得到商品硫銨。包裝后的硫銨成品送入硫銨倉庫。

 

The ammonium sulfate solution after absorbing and oxidizing shall be heated in the cooling section through the flue gas of boiler, evaporate the water and form the crystallization of ammonia sulfate. Discharge the solution with special pump and enter into the liquid tank of  sulfur ammonium materials, then send to the sulfur ammonium swirl device by the feed pump, ensure the solid content in the sulfur ammonium is up to- 50%, the diluted solution shall return to the sulfur ammonium material liquid tank. The concentrated solution shall flow into horizontal scroll discharge screen centrifuge and separate the solid sulfur ammonium (water content 2%), enter the fluidized bed dryer, ensure the water content of sulfur ammonium products≤1%, then enter material storehouse and packer, and finally get the finished products of sulfur ammonium. The sulfur ammonium finished product after packaging shall send to the sulfur ammonium warehouse.

 

見附圖工藝流程圖。See the attached process flow sheet.

 

煙氣系統(tǒng)

 

Flue gas system

 

1）煙道及其附件

 

1) Flue gas and its accessories

 

煙道根據(jù)可能發(fā)生的最差運行條件（例如：溫度、壓力、流量、污染物含量等）進行設(shè)計。

 

The flue gas may be designed according to the possible worst operating condition (such as temperature, pressure, flowing quantity, the content of contaminants etc.)

 

煙道設(shè)計能夠承受如下負荷：煙道自重、風荷載、灰塵積聚、內(nèi)襯和保溫的重量等。

 

The design of flue gas shall bear the following loads such as the self weight of gas flue, wind load, weight of accumulated dust, weight of liner and thermal insulation layer.

 

煙道最小壁厚至少按6mm設(shè)計，并考慮一定的腐蝕余量。煙道內(nèi)煙氣流速不超過15m/s。

 

The minimum wall thickness of flue gas shall be about 6mm at least in design. It is required to leave certain thickness for corrosion allowance. The flow rate inside the gas flue shall not exceed 15m/s.

 

所有沒有接觸到低溫飽和煙氣冷凝液的煙道或沒有接觸從吸收塔循環(huán)噴淋夾帶霧滴的煙道，用普通碳鋼或相當材料制作。

 

All flue gas that does not contact with condensate saturated under low temperature inside the gas flue or contact fog drop in the circulated spraying area inside the absorption tower shall apply the common carbon steel or related materials.

 

所有可能接觸腐蝕環(huán)境的凈煙氣煙道和原煙氣煙道（全部凈煙道，吸收塔入口段，旁路擋板門后煙道等）應(yīng)加適當?shù)谋Ｗo層（玻璃鱗片樹脂或相當材料），煙道的防腐方案提交給業(yè)主確認。