KUREHA ECOLOGY MANAGEMENT CO., LTD.

Transcription

1 Group グループ SOLVENT RECOVERY AND ODOR REMOVAL BY FLUIDIZED BED PROCESS KUREHA ECOLOGY MANAGEMENT CO., LTD.

2 GASTAK FEATURES (1) Advantageous Features of Bead Activated Carbon (G-BAC) High resistance to attrition, no dust produced Small diameter, higher adsorption capacity homogenous fluidized bed Low ash content, no catalytic reaction No deterioration over repeated reactivation Bead Activated Carbon (G-BAC) Conventional Charcoal (2) Fluidized Bed Adsorption System Adsorption in continuous fluidized bed and desorption in moving bed ensure uniform operation Continuous fluidized bed prevents heat accumulation Use of N2 or air minimizes or zeroes waste water Higher gas velocity in adsorber allows smaller space requirement Simple, uniform operation allows removal of dedicated operators Simple, Continuous, Safe and Efficient Solvent laden feed gas enters the bottom of the adsorber, and flows upward through the sieve trays. Upward flow of the feed gas fluidizes the G-BAC on the sieve trays. Adsorption of the VOC (volatile organic compounds) occurs in a counter current fashion as the progressively cleaner gas contacts cleaner G-BAC, which maximizes the efficiency of the process. Spent G-BAC exiting the bottom of the adsorber is transferred to the top of the desorber and flows downward through the heat exchanger. A small volume of stripping gas flows upward through the desorber, counter current to the G-BAC flow, to maximize stripping efficiency. Solvent vapor exiting the top of the desorber is transferred to the condenser. Reusable solvent recovered in the process is of high quality. (Right) Flow scheme of GASTAK Type OS Adsorption Section Isolation Section Desorption Section Steam Desorption Gas Isolation Section Carrier Gas Treated Gas BAC Moverment Gas Flow Sieve Tray Carrier Pipe Tubes Condenser Recovered Solvent 1

3 GASTAK APPLICATIONS GASTAK is applicable to wide range of objectives ranging from the recovery of organic solvents to the removal of odor and hazardous materials. Following types are available according to objectives and to impurities contained in effluent gas. Most suitable combination of heating medium and adsorption gas can be selected to ensure safe, efficient and economical operation. GASTAK TYPES Applications Type Heating Medium Desorption Gas Removed Matter Features Film Coating Tape Coating Gravure Printing Paint Shop SN Steam N2 Toluene Xylene MEK Other Organic Solvents 1. Low water content in recovered solvents 2. No condensed water Semiconductor Plant Liquid Crystal Gravure Printing HN Flue Gas Heating Oil Elec. Heater N2 Phenol Naphthalene IPA Organic Solvents 1. Low water content in recovered solvents 2. No condensed water Baking of Condiments Organic Fertilizer Plant HS Flue Gas Heating Oil Elec. Heater Steam Curry Odor Fertilizer Odor Odor Exhaust 1. High temp. desorption 2. Odorless treated air 3. Spent gas is incinerated PVC Resin Mfg. Plant Medicine Mfg. Plant OS Direct Heating by Steam Steam Methylene Chloride Endurance Fertilizer Plant Film Manufacturing Plant SA Steam Steam Perchloroethylene 1. Remarkably inexpensive to operate 2. Low water content in recovered solvents 3. No condensed water PVC Plant SS Steam Steam VCM GASTAK fundamental type 2

4 Organic Solvent Recovery GASTAK TYPE SN Efficient solvent recovery system avoiding waste water problem GASTSAK TYPE SN is a continuous, efficient unit to liquefy and recover solvent vapors contained in effluent gas stream using Kureha s original Bead Activated Carbon (G-BAC) as adsorbent. Rich G-BAC relieves the adsorbed solvent in the desorption section by means of hot nitrogen gas. Thus the chemical composition of the recovered solvent is kept unaltered, enabling reuse of recovered solvent. Consumption of nitrogen and steam is remarkably smaller than other processes, ensuring lower running costs. Trace of water vapor contained in the feed gas condenses together with solvent and is separated in a decanter. Plethora of experiences exist in various industries handling organic solvents such as printing shops, film manufacturing plants and chemical plants. Advantageous Features of GASTAK TYPE SN Best Suited for Flammable Solvents Desorption section is kept under nitrogen atmosphere. A device to constantly monitor O2 concentration of the recycling N2 gas stream is provided. High Purity Solvent Recovered No heavy metals contained in G-BAC and desorption under N2 atmosphere ensure very little chemical decomposition of recovered solvent. Recovery of water-soluble solvents such as acetone, iso-propyl-alcohol is possible. Easier Water Treatment Desorption by nitrogen minimizes generation of waste water and ensures easier treatment. Low Running Costs Nitrogen is recycled, minimizing consumption. Continuous adsorption and desorption minimize water and steam consumption. Easy to Maintain Minimal moving parts except for blowers allow easy, maintenance free operation. Optional SSR Available Optional installation of Side Stream Regenerator (SSR) remarkably extends the life G-BAC. GASTAK TYPE SN EXAMPLES Purpose Solvent Recovery Application Paint Shop Film Coating Tape Coating Flow Rate (Nm 3 /min) Temperature (deg C) Composition Concentration (ppm) MEK,MCS 2, Toluene 1,680 1, Toluene, Ethyl Acetate etc. 2,520 Treated Gas Concentration (ppm) 200 or less 30 or less 80 or less GASTAK Type SN SN SN G-BAC Quantity (kg) Recycle Rate (kg/hr) 12,500 2,800 1, ,000 4,000 Desorption Utility Gas Rate (Nm 3 /hr) Temperature (deg C) Electricity (kw) Steam (kg/hr) Cooling Water (ton/hr) Nitrogen (Nm 3 /hr) (Make-up water) (Make-up water) 12 Recovered Solvent (kg/hr)

5 TYPE SN PICTURE OF TYPE SN MODELS Single Tower Model Flow Scheme Two Tower Model Adsorber/Desorber Treated Gas Nitrogen Steam Cooling Water Condenser recovered solvent Glower Air Blower N2 Recycle Blower 4 Decanter

6 Bead Activated Carbon Odor Removal Unit GASTAK TYPE HN Efficient solvent recovery system avoiding waste water problems GASTAK TYPE HN is an efficient, easy-to-operate, maintenance-free odor removal unit using Kureha s original Bead Activated Carbon (G-BAC) as adsorbent. In the adsorption section, fluidized bed provides uniform, highly efficient removal of odor compounds. The G-BAC which has adsorbed odor compounds is air-lifted to the top of the desorption section for continuous desorption. G-BAC is heated up to 150 to 400 deg C in the desorption section. Nitrogen is introduced in the bottom of the desorption section and contacts with the G-BAC to desorb the odor compounds. The odor compounds desorbed from the G-BAC is cooled and condensed in the condenser. Advantageous Features of GASTAK TYPE HN Water Treatment Not Required Use of nitrogen as desorption gas eliminates spent water. Space Efficient Fluidized bed allows lower space requirement for larger gas flow rates. Continuous Operation Continuous adsorption and desorption provide uniform, continuous operation over long period of time. Electricity, water and nitrogen are only utilities required for operation. Easy to Maintain Minimal moving parts except for blowers allow maintenance free operation. Low Running Costs Fluidized bed allows low pressure drop, resulting in extremely low electric power requirement. Steam requirement is much less than fixed bed processes, alleviating treatment of waste water. GASTAK TYPE HN MODELS MODEL 50HN 80HN 120HN 180HN 240HN 300HN 420HN 550HN 750HN Gas Flow Rate (m 3 /min) up to 50 up to 80 up to 120 up to 180 up to 240 up to 300 up to 420 up to 550 up to 750 Dimensions Width (mm) Length (mm) Height (mm) Electric Facility (kw) Electric Consumption (kw) Cooling Water N2 Gas (Nm3/h) G-BAC Quantity (kg) Operation Weight (ton) *Desorption temperature is 200 deg C. *Models for gas flow rates over 750 Nm 3 /min are available. *Electricity consumption numbers include those for the chiller unit. 5

7 TYPE HN STANDARD LAYOUT & STANDARD FLOW Adsorber Desorber Condenser W Adsorber BAC Separator Desorber Condenser Adsorber Desorber H Condenser Blower Box Blower Box L Instrument Panel Standard Flow G-BAC Smelly compounds Treated Gas Lean G-BAC Rick G-BAC Blower Adsorber Carrier Gas Blower Desorber Nitrogen Cooling Water Condenser Recovered Solvent 6

8 Reactivation of Beads Activated Carbon GASTAK SSR Side-stream, high-temperature reactivation of G-BAC Adsorption activity of Kureha s Bead Activated Carbon (G-BAC), which is used in GASTAK process, may decrease during a long period of use. SSR is a side-stream, high-temperature, continuous reactivation apparatus specially designed for the G-BAC. Advantageous Features of GASTAK SSR Longer G-BAC Life SSR offers a unique option for maintaining carbon activity over a long period of time : thus prolongs service life of G-BAC. Concurrent Reactivation SSR continuously treats a small portion of the working volume of G-BAC and removes high boiling point compounds. SSR allows the customers to utilize the carbon adsorption for the circumstances which would be difficult or impossible with standard systems. This option is not applicable to the conventional fixed bed systems. AN OPERATIONAL RESULT GASTAK Solvent Load Toluene 210 kg/h Adsorbent G-BAC 7,000kg SSR 1 set Recovery Rate Chronological Change of Recovery Rate Start-up (BELOW) Picture of a standard SSR model GASTAK Start-up Months (RIGHT) An operational result is shown. SSR is commissioned at 6 months after the start-up of GASTAK. 7

9 TYPE SSR Flow Scheme Plot Plan & Elevation 8

10 KUREHA ECOLOGY MANAGEMENT CO., LTD. HEADQUARTERS 30 Shitannda, Nishiki-machi, Iwaki-shi, Fukushima-Pref, JAPAN TEL: (+81) FAX: (+81) OSAKA OFFICE , Dojima Axis Bldg, Dojimahama, Kita-ku, Osaka JAPAN TEL: (+81) FAX: (+81)