GEA is, among others, a single-source supplier of cost effective, energy efficient and reliable wastewater evaporator systems, based on using spray drying evaporation.
Drying of salt and solid-containing effluents from various industrial processes, including wastewater streams from wet type FGD (flue-gas desulfurization), is efficiently enabled using the well-proven GEA spray drying technology and proprietary equipment. The heat of the hot flue gas from the industrial process is used to evaporate the water in the effluent, leaving a dry powder to be collected in a downstream filter with no liquid effluent discharge at all.
Spray drying is a mature technology that was developed over a century ago. GEA has successfully delivered installations worldwide across many different spray drying applications in the power, waste to energy, sinter & metallurgical and glass industries — to name some.
Key features
- Mature and well-proven technology.
- Unmatched rotary atomizer.
- Excellent performance and with outstanding distribution of droplets' size.
- Flexible process.
- The heat source for effluent evaporation can be hot flue gas or pre-heated combustion air.
- Dried salts and solids can be collected either in an optional particular filter or in the main dust collector.
- Can be adapted for large variations of hot gas temperatures and ash load.
- Full ranges of atomizer sizes for different effluent capacities.
- System simplicity. Carbon steel construction with high degree of local supply.
Working Principle
Working Principle of Spray Drying Evaporation
The GEA spray drying evaporation process is highly efficient yet very simple, as it basically consists of the spray dryer evaporator module and a down-stream filter.
A slipstream of hot flue gas is fed into a spray-drying chamber where it immediately comes in contact with a fine spray from atomization of the discharged scrubber liquid of a wet FGD (WFGD) system.
There is a precise control of the gas distribution, the WFGD scrubber liquid flow rate and droplet size to ensure that all droplets are converted into a fine dry powder.
The flue gas further flows into an optional dust collector or the main filter where any remaining suspended solids are removed. The filtered flue gases are then fed to the wet FGD for acid gases removal.
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重金属除去
重金属による環境汚染はますます問題視され、世界的な関心事となっています。GEA では非鉄金属産業分野でよく用いられるカロメル処理に加え、湿式電気集塵機（ESP）、噴霧乾燥吸収（SDA）、セラミック触媒キャンドル（BisCat）を使用し、排ガス中の重金属を削減しています。
気泡塔リアクター
気泡塔は液体と気体の体積比が大きいのが特徴で、液相での反応が遅い場合に大容量の反応を実現することができます。接触装置のドライスポットを避けなければならない場合に最適です。
転炉ガス回収（LTプロセス）
高温の金属を鉄に変換する際には、高熱量の CO を含んだガスが発生します。これらのガスを回収することで、かなりのエネルギーを節約することができるのです。この LT 鋼ガスプロセスは世界的に確立されています。
エアロゾル分離システム
ベンチュリースロートの直前に、適切なスクラビング液が特殊ノズルによって噴射され、断面全体にわたって均一に分配されます。
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